Misplaced Pages

Boeing 737 MAX
Alaska Airlines Boeing 737 MAX 9 taking off from Seattle–Tacoma International Airport in March 2023
General information
Type	Narrow-body airliner
National origin	United States
Manufacturer	Boeing Commercial Airplanes
Status	In service
Primary users	Southwest Airlines Ryanair United Airlines Alaska Airlines
Number built	1,663 as of November 2024
History
Manufactured	2014–present
Introduction date	May 22, 2017 with Malindo Air
First flight	January 29, 2016; 8 years ago (January 29, 2016)
Developed from	Boeing 737 Next Generation

This article is part of a series about Boeing 737 MAX
Orders and deliveries Certification Maneuvering Characteristics Augmentation System Accidents Lion Air Flight 610 Ethiopian Airlines Flight 302 Alaska Airlines Flight 1282 737 MAX groundings Financial impact of groundings List of groundings Reactions to groundings
v t e

The Boeing 737 MAX is the fourth generation of the Boeing 737, a narrow-body airliner manufactured by Boeing Commercial Airplanes. It succeeds the Boeing 737 Next Generation (NG) and competes with the Airbus A320neo family. The series was announced in August 2011, first flown in January 2016, and certified by the US Federal Aviation Administration (FAA) in March 2017. The first 737 MAX delivered to a customer was a MAX 8 to Malindo Air, which accepted and began operating the aircraft in May 2017.

The 737 MAX is based on earlier 737 designs, with more efficient CFM International LEAP engines, aerodynamic changes including distinctive split-tip winglets, and airframe modifications. The 737 MAX series has been offered in four variants, with 138 to 204 seats in typical two-class configuration, and a range of 3,300 to 3,850 nautical miles (6,110 to 7,130 km; 3,800 to 4,430 mi). The 737 MAX 7, MAX 8, and MAX 9 are intended to replace the 737-700, -800, and -900 respectively, and a further-stretched 737 MAX 10 is available. However, as of October 2024, the MAX 7 and MAX 10 have not been certified, with the FAA declining to provide a timetable for approval. As of November 2024, the 737 MAX has 4,804 unfilled orders and 1,663 deliveries.

The 737 MAX has been involved in two fatal accidents: Lion Air Flight 610 in late 2018 and Ethiopian Airlines Flight 302 in early 2019. 346 people died in total. Contributing to the accidents was the Maneuvering Characteristics Augmentation System (MCAS), which activated unexpectedly due to erroneous angle of attack data, and remained active because of pilot error caused by inadequate training. The aircraft was subsequently grounded worldwide from March 2019 to November 2020, with the FAA garnering criticism for being the last major authority to ground it.

Investigations found Boeing did not fully inform operators about MCAS and found shortcomings in the FAA's certification process for the aircraft. The accidents and grounding cost Boeing an estimated US$20 billion in fines, compensation, and legal fees as of 2020, with indirect losses of more than US$60 billion from 1,200 cancelled orders. In 2021, Boeing paid US$2.5 billion in penalties and compensation to settle the DOJ's fraud conspiracy case against the company.

Further investigations revealed the FAA and Boeing had colluded on recertification test flights and attempted to cover up important information, and that the FAA had retaliated against whistleblowers. The FAA cleared the aircraft to return to service on November 18, 2020, subject to mandated design and training changes. Canadian and European authorities followed in late January 2021. By December 2021, when Chinese authorities lifted their grounding, 180 of 195 countries had cleared the 737 MAX to return to service.

In January 2024, the doorway closure blew out of an unused exit doorway on Alaska Airlines Flight 1282, causing an uncontrolled decompression of the aircraft. The FAA immediately mandated a grounding and inspections of all 737 MAX 9 with a similar configuration; affected aircraft were returned to service starting at the end of that month. The investigation found the plug was not fully bolted into place during production; a subsequent FAA audit found many problems in the production process.

Development

Background

In 2006, Boeing began to consider replacing the 737 with a "clean sheet" design that could follow the Boeing 787 Dreamliner. In June 2010, executives postponed the decision. On December 1, 2010, Boeing competitor Airbus launched the Airbus A320neo family, which offered better fuel economy and operating efficiency than the 737, thanks to its engines: the LEAP from CFM International and the PW1000G from Pratt & Whitney.

In February 2011, Boeing CEO Jim McNerney said, "We're going to do a new airplane." The company had been developing a new aircraft to replace the 737 as part of its Yellowstone Project. In March 2011, Boeing CFO James A. Bell told investors that the company might re-engine the 737, but later that month Boeing Commercial Airplanes President James Albaugh said that the company was not sure about that. The Airbus A320neo gathered 667 commitments at the June 2011 Paris Air Show, bringing its order backlog to 1,029 aircraft, an order record for a new commercial airliner.

On July 20, 2011, American Airlines, which had long bought only Boeing jets, announced an order for 460 narrowbody jets including 130 A320ceo (current engine option), 130 A320neo, and 100 737NG. Officials also said they would order 100 re-engined 737s with CFM LEAP if Boeing pursued the project.

Program launch

Faced with the record orders for Airbus and the defection of a long-time customer, on August 30, 2011, Boeing's board of directors approved the launch of the re-engined 737, which they said would meet or exceed the range of the Airbus A320neo while burning 4% less fuel. Studies for additional drag reduction were performed during 2011, including revised tail cone, natural laminar flow nacelle, and hybrid laminar flow vertical stabilizer. To focus on the re-engine project, Boeing abandoned the development of a new design under its Yellowstone Project. Firm configuration for the 737 MAX was scheduled for 2013.

In March 2010, the estimated cost to re-engine the 737, according to Mike Bair, Boeing Commercial Airplanes' vice president of business strategy and marketing, would be US$2–3 billion, including the CFM engine development. During Boeing's Q2 2011 earnings call, CFO James Bell said the development cost for the airframe only would be 10–15% of the cost of a new program, which was estimated at US$10–12 billion at the time. Bernstein Research predicted in January 2012, that this cost would be twice that of the A320neo. The MAX development cost could have been well over the internal target of US$2 billion, and closer to US$4 billion. Fuel consumption is reduced by 14% from the 737NG. Southwest Airlines was signed up as the launch customer in 2011.

In November 2014, McNerney said the 737 would be replaced by a new airplane by 2030—probably using composite materials—that would be slightly bigger and have new engines but would retain the 737's general configuration. Boeing talked about developing a clean sheet aircraft to replace the 737. The conceived aircraft was to have a fuselage similar to the 737 though slightly larger, and would make use of the advanced composite technology developed for the 787 Dreamliner. Boeing also considered a parallel development along with the 757 replacement, similar to the development of the 757 and 767 in the 1970s.

Production

On August 13, 2015, the first 737 MAX fuselage completed assembly at Spirit Aerosystems in Wichita, Kansas, for a test aircraft that would eventually be delivered to launch customer Southwest Airlines. On December 8, 2015, the first 737 MAX—a MAX 8 named Spirit of Renton—was rolled out at the Boeing Renton Factory.

Because GKN could not produce the titanium honeycomb inner walls for the thrust reversers quickly enough, Boeing switched to a composite part produced by Spirit to deliver 47 MAXs per month in 2017. Spirit supplies 69% of the 737 airframe, including the fuselage, thrust reverser, engine pylons, nacelles, and wing leading edges.

A new spar-assembly line with robotic drilling machines was expected to increase throughput by 33%. The Electroimpact automated panel assembly line sped up the wing lower-skin assembly by 35%. Boeing planned to increase its 737 MAX monthly production rate from 42 planes in 2017, to 57 planes by 2019. The new spar-assembly line is designed by Electroimpact. Electroimpact has also installed fully automated riveting machines and tooling to fasten stringers to the wing skin.

The rate increase strained the production and by August 2018, over 40 unfinished jets were parked in Renton, awaiting parts or engine installation, as CFM engines and Spirit fuselages were delivered late. After parked airplanes peaked at 53 at the beginning of September, Boeing reduced this by nine the following month, as deliveries rose to 61 from 29 in July and 48 in August.

On September 23, 2015, Boeing announced a collaboration with Comac to build a completion and delivery facility for the 737, in Zhoushan, China, the first outside the United States. This facility initially handles interior finishing only, but will subsequently be expanded to include paintwork. The first aircraft was delivered from the facility to Air China on December 15, 2018.

The largest part of the suppliers cost are the aerostructures at US$10–12 million (35-34% of the US$28.5−35 million total), followed by the engines at US$7−9 million (25-26%), systems and interiors at US$5–6 million each (18-17%), then avionics at US$1.5–2 million (5-6%).

Flight testing and certification

The 737 MAX gained its airworthiness approval based on the 737 legacy series (first approved on December 15, 1967), as a Supplemental type certificate (STC), in lieu of a new design approval. The MAX's first flight took place on January 29, 2016, at Renton Municipal Airport, nearly 49 years after the maiden flight of the original 737-100, on April 9, 1967. The first MAX 8, 1A001, was used for aerodynamic trials: flutter testing, stability and control, and takeoff performance-data verification, before it was modified for an operator and delivered. 1A002 was used for performance and engine testing: climb and landing performance, crosswind, noise, cold weather, high altitude, fuel burn and water-ingestion. Aircraft systems including autoland were tested with 1A003. 1A004, with an airliner layout, flew function-and-reliability certification for 300 hours with a light flight-test instrumentation.

The 737 MAX 8 gained FAA certification on March 8, 2017, and in the same month was approved by the European Union Aviation Safety Agency (EASA) on March 27, 2017. After completing 2,000 test flight hours and 180-minute ETOPS testing requiring 3,000 simulated flight cycles in April 2017, CFM International notified Boeing of a possible manufacturing quality issue with low pressure turbine (LPT) discs in LEAP-1B engines. Boeing suspended 737 MAX flights on May 4, and resumed flights on May 12.

During the certification process, the FAA delegated many evaluations to Boeing, allowing the manufacturer to review their own product. It was widely reported that Boeing pushed to expedite approval of the 737 MAX to compete with the Airbus A320neo, which hit the market nine months ahead of Boeing's model.

Entry into service

The first delivery was a MAX 8 on May 16, 2017 to the then Malindo Air (now Batik Air Malaysia); it entered service on May 22. Norwegian Air International was the second airline to put a 737 MAX into service, when it performed its first transatlantic flight with a MAX 8 named Sir Freddie Laker on July 15, 2017, between Edinburgh Airport in Scotland and Bradley International Airport in the U.S. state of Connecticut.

Boeing aimed for 737 MAX to match the 99.7% dispatch reliability of the 737 Next Generation (NG). Southwest Airlines, the launch customer, took delivery of its first 737 MAX on August 29, 2017. Boeing planned to deliver at least 50 to 75 aircraft in 2017, 10–15% of the more than five hundred 737s to be delivered in the year.

Grounding and recertification

The 737 MAX was grounded after two fatal crashes, Lion Air Flight 610 on October 29, 2018, and Ethiopian Airlines Flight 302 on March 10, 2019, in which a total of 346 people died. The day following the second crash, China became the first air authority to ground the aircraft, followed the next day by Australia, the European Union, India, Malaysia, Singapore, South Korea, and Turkey. The United States Federal Aviation Administration was one of the last to ground the aircraft, defending against groundings by issuing a Continued Airworthiness Notice to operators on March 11, garnering criticism before finally grounding it on March 13, 2019.

Contributing to the accidents was the Maneuvering Characteristics Augmentation System (MCAS), which activated unexpectedly due to erroneous angle of attack data, and inadequate pilot training. Investigations found Boeing did not fully inform operators about MCAS and found shortcomings in the FAA's certification process for the aircraft.

In the twenty months the aircraft was grounded, Boeing redesigned the computer architecture that supported MCAS. As initially designed, data from just one of the aircraft's two angle-of-attack (AoA) sensors was fed into MCAS. When erroneous data from that sensor was fed into flight computers, it caused repeated uncommanded activation of MCAS, which applied nose-down trim to the horizontal stabilizer. The accident investigations revealed that the AoA sensor on Lion Air Flight 610 was miscalibrated, and the Ethiopian Airlines Flight 302 sensor was likely damaged by a bird strike during takeoff. Boeing was criticized for using data from just one of the two sensors, representing a single point of failure on a flight control system.

Before the crash of Lion Air Flight 610, pilots were not informed by Boeing of the existence of MCAS and were not required to undergo simulator training on the difference between the 737 MAX and earlier 737 versions. Boeing and the FAA would later require simulator training to demonstrate an MCAS activation to pilots.

The final report by the National Transportation Safety Committee of Indonesia into the Lion Air crash criticized Boeing's design and the FAA's certification process for the MCAS flight-control system and said the issues were compounded by maintenance issues and lapses by Lion Air's maintenance crews and its pilots, as well as Xtra Aerospace, a US-based company that supplied Lion Air with a replacement AoA sensor that was likely miscalibrated.

In the crash of Ethiopian Airlines Flight 302, the U.S. National Transportation Safety Board and France's Bureau of Enquiry and Analysis for Civil Aviation Safety identified pilot error and inadequate training by Ethiopian Airlines as critical contributing factors to the crash.

Boeing faced legal and financial consequences, as no deliveries of the MAX could be made while the aircraft was grounded, and airlines canceled more orders than Boeing produced during this period. Boeing found foreign object debris in the fuel tanks of 35 of 50 grounded 737 MAX aircraft that were inspected and had to check the remainder of the 400 undelivered planes. The FAA curtailed Boeing's delegated authority and invited global aviation stakeholders to comment on pending changes to the aircraft and to pilot training. The FAA lifted its grounding order in 2020; all aircraft must be repaired to comply with various airworthiness directives.

After being charged with fraud in connection of both crashes of the 737 MAX, Boeing settled by paying over US$2.5 billion in penalties and compensation: a criminal monetary penalty of $243.6 million, $1.77 billion in damages to airline customers, and $500 million to a fund for the families of crash victims.

Production slowdown and suspension

From mid-April 2019, Boeing announced that it was temporarily cutting production of the 737 aircraft from 52 per month to 42 amid the 737 MAX groundings. Production of the LEAP-1B engine continued at an unchanged rate, enabling CFM to catch up its backlog within a few weeks.

As the 737 MAX recertification moved into 2020, Boeing suspended production from January to conserve funds and prioritize stored aircraft delivery. The 737 MAX program was the company's largest source of profit. Around 80% of the 737 production costs involve payments to parts suppliers, which may be as low as US$10 million per plane. After the announcement, Moody's cut Boeing's debt ratings in December, citing the rising costs due to the grounding and the production halt including financial support to suppliers and compensation to airlines and lessors which could lower the program's margins and cash generation for years. The rating agency also warned that the production halt would have wide and harmful impact to the whole aerospace and defense supply chain and the ramp-up would be slower than previously anticipated. CFM International reduced production of the LEAP-1B for the 737 MAX, in favor of the LEAP-1A for the Airbus A320neo, but was prepared to meet demand for both aircraft.

Boeing did not publicly say how long the suspension would last. The last pre-suspension fuselages entered final assembly in early January 2020. Boeing was reported to internally expect production to be halted for at least 60 days. Industry observers began to question if Boeing's projection of record production rate of 57 per month would ever be reached. In early April, the COVID-19 pandemic led Boeing to shut down its other airliner production lines and further delayed recertification of the MAX.

Recertification and return to service

In early January 2020, an issue was discovered in the MAX software update, which impacted its recertification effort. As of mid-January, Boeing expected the MAX to return to service by mid-2020. In late April, following the COVID-19 pandemic, Boeing then hoped to win regulatory approval by August 2020. Between June 29 and July 1, the FAA and Boeing conducted a series of recertification test flights. Transport Canada and EASA each concluded their own independent recertification flights in late August and early September. On November 18, the FAA announced that the MAX had been cleared to return to service. Before individual aircraft could resume service, repairs were required as set out in an airworthiness directive from the FAA. Airline training programs also required approval.

On December 3, American Airlines made a demonstration flight for journalists to explain the FAA-required modifications, to regain public trust. The first airline to resume regular passenger service was Brazilian low-cost Gol on December 9. The first in the United States was American Airlines on December 29.

Transport Canada and EASA both cleared the MAX in late January 2021, subject to additional requirements. Other regulators worldwide progressively ungrounded the aircraft, including those in the UAE, Australia, Kenya, and Brazil. The Indian Directorate General of Civil Aviation (DGCA) rescinded its ban on MAX airplanes in late August on the condition that they meet the requirements set by the FAA and EASA. China's civil aviation regulator (CAAC) cleared the 94 jets stored by 11 carriers in China to fly again in December 2021. Deliveries of Chinese airplanes stored by Boeing is expected to resume in 4Q 2023. However, EASA forbade airlines from performing RNP AR approaches with the MAX. In response to the recertification, some booking sites introduced tools allowing travelers to filter results to avoid flying on the type.

Production ramp-up and recovery

In late January 2020, production was expected to restart in April and take a year and a half to clear the inventory of 400 airplanes, ramping up slowly and building over time: Boeing might have delivered 180 stored jets by year-end and produce an equal number. Boeing did not disclose any possible effect on deliveries caused by the FAA's withdrawal of Boeing's delegated authority to certify the airworthiness of each aircraft. MAX supplier Spirit AeroSystems said it does not expect to return production rate to 52 per month until late 2022. On May 27, Boeing resumed 737 MAX production at a low production rate, with the rate planned to increase towards 31 per month in 2021. On August 19, Boeing announced that it had received new orders for the 737 MAX for the first time in 2020. Per a statement from the company, Poland's Enter Air SA entered into an agreement to buy up to four 737s. On October 28, Boeing indicated that it expected to deliver about half of the 450 stockpiled aircraft in 2021, and the majority of the remainder in 2022, noting that some of these aircraft will need to be re-marketed and potentially reconfigured. The delivery rate will also condition the production rate for new aircraft, to avoid compounding the problem. In November, Boeing saw more than 1,000 order cancelations since the grounding in March 2019. Some of these already-built aircraft have seen their order canceled and Boeing is working to find new customers to take delivery.

In late January 2022, Boeing's Chief Financial Officer said the 737 program was producing at a rate of 27 aircraft a month and was on track to ramp up the production. On March 4, Boeing reportedly had preliminary plans to ramp up production of the 737 MAX aircraft to about 47 a month by the end of 2023 as the company looked to extend its recovery from successive crises. On July 12, the company said it had met its goal of increasing 737 production to 31 per month when it reported its June order and delivery tally. In September, however, the company noted that it was regularly having to pause production due to component shortages and other supply chain problems.

In late January 2023, Boeing announced that a fourth production line for the 737 MAX would open at the Boeing Everett Factory in Everett, Washington. The line will replace the discontinued Boeing 787 line at the factory. However, after the January 2024 Alaska Airlines Flight 1282 accident in which a door plug became detached (after not being bolted in place by Boeing) and resulted in an uncontrolled decompression of the aircraft, the FAA announced it would not grant any production expansion of the 737 MAX until it is satisfied that more stringent quality control measures have been enacted.

Certification of the MAX 7 and MAX 10

Following the recertification of the MAX 8 and MAX 9, Boeing resumed work to certify the MAX 7 and MAX 10. In March 2022, there were rumors that Boeing would request an exemption from the U.S. Aircraft Safety and Certification Reform Act of 2020, a safety reform law passed in response to the MAX crashes. The act requires airliners to be fitted with an engine-indicating and crew-alerting system (EICAS) if type certificated after December 31, 2022. Adding this feature would make the MAX 7 and MAX 10 different from other MAX variants, necessitating additional training for pilots.

In November 2022, Boeing announced expected delays to the certification of the MAX 7 and MAX 10, then expected in early 2023 and early 2024 respectively. In December, two proposals to exempt the MAX 7 and MAX 10 from the new EICAS requirements were considered for inclusion in a U.S. defense spending bill—one a simple two-year extension to the deadline, the second an exemption for aircraft whose certification applications were submitted before the law was enacted, combined with some equipment changes—but neither proposal was included in the final spending bill.

The U.S. Congress agreed in December 2022 on a bill allowing Boeing to certify the MAX 7 and MAX 10 without EICAS but required that the company must install a third angle-of-attack sensor in all 737 MAX types as previously demanded by European and Canadian regulators. The company also must install a switch to disable the stick shaker, which distracted pilots during the MAX crashes. Boeing would have to retrofit these design changes to all 737 MAXs already delivered in Canada, Europe, and the U.S. within three years of MAX 10 certification.

Boeing requested an additional exemption for the MAX 7 in December 2023. The exemption was related to a problem with the engine anti-ice system Boeing had announced in August 2023 that affected all MAX variants. Boeing had found that if pilots left the engine anti-ice system running after icing was no longer an issue, the system could heat the carbon composite inlet at the front end of the pod surrounding the engine (known as a nacelle) to break and fall off, potentially damaging the engine or fuselage. Boeing said that it was working on a fix for all MAX variants and requested that it be exempted from correcting the MAX 7 before it was allowed to enter service. Boeing withdrew its exemption request in January 2024 after being asked to do so in meetings with the U.S. Congress held after the Alaska Airlines Flight 1282 accident. As of February 2024, Boeing estimated that the development, testing and validation of the fix to the anti-ice system would take an additional nine to 18 months.

As of February 2024, the MAX 7 and MAX 10 have not been certified, with the FAA declining to put any timetable on approval.

The delays have set back the fleet plans of major carriers including Southwest Airlines and United Airlines, the biggest customers for the MAX 7 and MAX 10 respectively. United also gave a rare, public rebuke of Boeing saying it was "disappointed" with the company and would no longer include the MAX 10 in its fleet planning, and had a meeting with Airbus to discuss securing more favorable production slots to enable the airline to introduce A321neos more rapidly to cover the delayed MAX 10s.

Design

In mid-2011, one design objective was matching fuel burn of the 737 MAX to that of the Airbus A320neo's 15% fuel-burn advantage. The initial 737 MAX reduction was 10–12%; it was later enhanced to 14.5%. The fan was widened from 61 inches (150 cm) to 69.4 in (176 cm) by raising the nose gear and placing the engine higher on the wing and further forward. The split tip winglet added 1–1.5% fuel burn reduction and a re-lofted tail cone another 1%. Electronically controlling the bleed air system improved efficiency. The new engine nacelle included chevrons, similar to those of the Boeing 787, which also helped to reduce engine noise.

Aerodynamic changes

The 737 MAX uses a split-tip winglet, designed to reduce vortex drag, which improves fuel efficiency by maximizing lift, while staying in the same ICAO aerodrome reference code letter C gates as current Boeing 737s. It resembles a three-way hybrid of a blended winglet, wingtip fence, and raked wingtip. A split-tip wingtip was first proposed for the McDonnell Douglas MD-12, a 1990s twin-deck aircraft concept. A MAX 8 with 162 passengers on a 3,000-nautical-mile (5,600 km; 3,500 mi) flight is projected to have a 1.8% lower fuel burn than a blended winglet-equipped aircraft (like many 737NG aircraft) and 1% lower over 500 nmi (930 km; 580 mi) at Mach 0.79. The new winglet has a total height of 9 feet 6 inches (2.90 m).

Other improvements include a re-contoured tail cone, revised auxiliary power unit inlet and exhaust, aft body vortex generator removal, and other small aerodynamic improvements.

The engines on the 737 MAX were also repositioned, the top of the new engine slightly higher than the top surface of the wing, resulting in a change to the aerodynamic characteristics of the airframe. Due to the aircraft's close proximity to the ground, the larger and more fuel-efficient engines did not have enough clearance. As a result, the engines were mounted higher on the wings and further forward, changing the aerodynamic characteristics of the aircraft compared to the 737NG. The MCAS software-based flight control law was implemented to account for the undesirable aerodynamic changes.

Structural and other changes

The 8-inch (20 cm) taller nose-gear strut maintains the same 17-inch (43 cm) ground clearance of previous 737 engine nacelles. New struts and nacelles for the heavier engines add bulk, the main landing gear and supporting structure have been reinforced, and fuselage skins are thicker in some places—thus adding 6,500 pounds (2,900 kg) to the MAX 8's empty aircraft weight. To preserve fuel and payload capacity, its maximum takeoff weight is 7,000 lb (3,200 kg) heavier.

Rockwell Collins was selected to supply four 15.1-inch (380 mm) liquid-crystal displays (LCD), as used on the 787, for the glass cockpit to improve pilots' situation awareness and efficiency. Boeing plans no major modifications for the 737 MAX flight deck, as it wants to maintain commonality with the 737 Next Generation family. Boeing Commercial Airplanes CEO Jim Albaugh said in 2011, that adding more fly-by-wire control systems would be "very minimal". However, the 737 MAX extended spoilers are fly-by-wire controlled. Most of the systems are carried from the 737NG to allow for a short differences-training course to upgrade flight crews.

In addition to the Speed Trim System (STS), the automatic stabilizer control system has been enhanced to include MCAS. Compared to STS, MCAS has greater authority and cannot be disengaged with the aft and forward column cutout switches. The center console stabilizer-trim cutout switches have been re-wired. Unlike previous versions of the 737, the automatic stabilizer trim control functions cannot be turned off while retaining electric trim switches functionality.

MCAS was deemed necessary by Boeing to meet its internal objective of minimizing training requirements for pilots already qualified on the 737NG. MCAS was to automatically mitigate the pitch-up tendency of the new flight geometry due to the engines being located farther forward and higher than on previous 737 models. During a reassessment of the aircraft in February 2020, both FAA and EASA determined that the stability and stall characteristics of the plane would have been acceptable with or without MCAS.

As a production standard, the 737 MAX features the Boeing Sky Interior with overhead bins and LED lighting based on the Boeing 787's interior.

Engines

In 2011, the CFM LEAP-1B engine was initially 10–12% more efficient than the previous 61-inch (156 cm) CFM56-7B of the 737NG. The 18-blade, woven carbon-fiber fan enables a 9:1 bypass ratio (up from 5.1:1 with the previous 24-blade titanium fan) for a 40% smaller noise footprint. The CFM56 bypass ranges from 5.1:1 to 5.5:1. The two-spool design has a low-pressure section comprising the fan and three booster stages driven by five axial turbine stages and a high-pressure section with a 10-stage axial compressor driven by a two-stage turbine. The 41:1 overall pressure ratio increased from 28:1, and advanced hot-section materials enabling higher operating temperatures permit a 15% reduction in thrust-specific fuel consumption (TSFC), along with 20% lower carbon emissions, 50% lower nitrogen-oxide emissions, though each engine weighs 849 pounds (385 kg) more at 6,129 pounds (2,780 kg).

In August 2011, Boeing had to choose between 66-inch (168 cm) or 68-inch (173 cm) fan diameters, necessitating landing gear changes to maintain a 17 in (43 cm) ground clearance beneath the new engines; Boeing Commercial Airplanes chief executive officer Jim Albaugh stated "with a bigger fan you get more efficiency because of the bypass ratio more weight and more drag", with more airframe changes.

In November 2011, Boeing selected the larger fan diameter, necessitating a 6–8 in (15–20 cm) longer nose landing gear. In May 2012, Boeing further enlarged the fan to 69.4 in (176 cm), paired with a smaller engine core within minor design changes before the mid-2013 final configuration.

The nacelle features chevrons for noise reduction like the 787. A new bleed air digital regulator will improve its reliability. The new nacelles being larger and more forward possess aerodynamic properties which act to further increase the pitch rate. The larger engine is cantilevered ahead of and slightly above the wing, and the laminar flow engine nacelle lipskin is a GKN Aerospace one-piece, spun-formed aluminum sheet inspired by the 787.

Operational history

After one year of service, 130 MAXs had been delivered to 28 customers, logging over 41,000 flights in 118,000 hours and flying over 6.5 million passengers. Flydubai observed 15% more efficiency than the NG, more than the 14% promised, and dependability reached 99.4%. Long routes include 24 over 2,500 nautical miles (4,630 km; 2,877 mi), including a daily Aerolíneas Argentinas service from Buenos Aires to Punta Cana over 3,252 nmi (6,023 km; 3,742 mi).

In 2019, Moody's had estimated Boeing's operating margin to be US$12–15 million for each 737 MAX 8 at its list price of $121.6 million (~$143 million in 2023), although the list price is usually discounted 50–55% in practice. This high margin was made possible by the efficiencies of production volume and the amortization of development costs and capital investment over the decades of the program run. However, costs have since risen significantly and the margin reduced following the two crashes, the FAA grounding, and the severe disruption to production. Boeing estimated it would cost an additional $6.3 billion to produce the remaining 737 MAX program, $4 billion for "future abnormal costs" as production restarted, plus an estimated $8.3 billion for concessions and compensation to customers. The rising costs also led Moody's to downgrade Boeing's credit rating.

Variants

The 737-700, -800 and -900ER, the most widespread versions of the previous 737NG, are succeeded by the 737 MAX 7, MAX 8 and MAX 9, respectively (FAA type certificate and marketing designation (since 2020): 737-7, -8, and -9). The 737 MAX 8 entered service in May 2017, the MAX 9 entered service in March 2018, and the MAX 200 (a high-density version of the MAX 8) entered service in June 2021. Deliveries for the MAX 7 and the MAX 10 are expected to begin in 2024, after years of delays.

In February 2018, Boeing forecast that 60–65% of demand for the airliner would be for the 737 MAX 8 variant, 20–25% for the MAX 9 and MAX 10, and 10% for the MAX 7.

737 MAX 7

At the July 2016 Farnborough Air Show, Boeing announced that the MAX 7, originally based on the 737-700, will accommodate two more seat rows than the 737-700 for 138 seats. Compared to the 737-700, the MAX 7 has a pair of over-wing exit doors rather than the single-door, a 46-inch longer aft fuselage and a 30-inch longer forward fuselage, structural re-gauging and strengthening, and systems and interior modifications to accommodate the longer length. The MAX 7 uses the same wing and landing gear as the MAX 8. It is expected to fly 1,000 nmi (1,900 km; 1,200 mi) farther than the -700 with 18% lower fuel costs per seat. Boeing predicts that the MAX 7 will carry 12 more passengers 400 nmi (740 km; 460 mi) farther than A319neo with seven percent lower operating costs per seat.

Production on the first 65-foot-long (20 m) wing spar for the 737-7 began in October 2017. Assembly of the first flight-test aircraft began on November 22, 2017, and was rolled out of the factory on February 5, 2018. The MAX 7 took off for its first flight on March 16, 2018, from the factory in Renton, Washington, and flew for three hours over Washington state. It reached 250 knots (460 km/h; 290 mph) and 25,000 ft (7,600 m), performed a low approach, systems checks and an inflight engine restart, and landed at Boeing's flight test center in Moses Lake, Washington.

Entry into service with launch operator Southwest Airlines was originally expected in January 2019, however, it has been repeatedly delayed. Southwest had ordered a total of 234 MAX 7s. WestJet also ordered 22 MAX 7s, but later converted those into MAX 8s amid the delays. In 2022, Southwest announced that it would take early delivery of its MAX 8 orders to make up for the delay of the MAX 7.

As of January 2024, Southwest has removed the MAX 7 from future fleet planning, however, the company said that it remained committed to the type, and was willing to wait until 2026 or 2027 for first delivery.

737 MAX 8

The first variant developed in the 737 MAX series; the MAX 8 replaces the 737-800 with a longer fuselage than the MAX 7. In 2016, Boeing planned to improve its range from 3,515 nautical miles (6,510 km; 4,045 mi) to 3,610 nmi (6,690 km; 4,150 mi) after 2021. On July 23, 2013, Boeing completed the firm configuration for the 737 MAX 8. The MAX 8 has a lower empty weight and higher maximum takeoff weight than the A320neo. During a test flight conducted for Aviation Week, while cruising at a true airspeed of 449 knots (517 mph; 832 km/h) and a weight of 140,500 pounds (63,700 kg), at a lower than optimal altitude (FL350 vs. the preferred FL390) and with an "unusually far forward" center of gravity, the test aircraft consumed 4,460 lb (2,020 kg) of fuel per hour.

The Boeing 737 MAX 8 completed its first flight test in La Paz, Bolivia. The 13,300-foot (4,100 m) altitude at El Alto International Airport tested the MAX's capability to take off and land at high altitudes. Its first commercial flight was operated by Malindo Air on May 22, 2017, between Kuala Lumpur and Singapore as Flight OD803. In early 2017, a new MAX 8 was valued at $52.85 million, rising to below $54.5 million by mid 2018.

737 MAX 200

In September 2014, Boeing launched a high-density version of the 737 MAX 8, the 737 MAX 200 or 737-8-200, named for seating for up to 200 passengers in a single-class high-density configuration with slimline seats; an extra pair of exit doors is required because of the higher passenger capacity. Boeing states that this version would be 20% more cost-efficient per seat than current 737 models and would be the most efficient narrow-body on the market when delivered, including 5% lower operating costs than the 737 MAX 8. Three of eight service trolleys are removed to accommodate more passenger space. An order with Ryanair for 100 aircraft was finalized in December 2014.

In mid-November 2018, the first of then 135 ordered by Ryanair rolled out, in a 197-seat configuration. It was first flown from Renton on January 13, 2019, and was due to enter service in April 2019, with another four MAX 200s expected later in 2019, though certification and deliveries were deferred while the MAX was grounded. In November 2019, Ryanair informed its pilots that, due to an unspecified design issue with the additional over-wing exit doors, it did not expect to receive any MAX 200s until late April or early May 2020. In 2020, at the height of the COVID travel slump, Ryanair renegotiated its order and purchased an additional 75 MAX 200 aircraft at one-third of the list price.

The high-density variant was certified by the FAA on March 31, 2021. Ryanair took delivery of its first MAX 200 in June 2021. Besides launch customer Ryanair, other customers include International Airlines Group and low-cost airlines Akasa Air of India, Allegiant Air of the US, Arajet of the Dominican Republic and Vietnam's VietJet.

Proposed 737-8ERX

Airlines have been shown a 737-8ERX concept based on the 737 MAX 8 with a higher 194,700-pound (88.3 t) maximum take-off weight and a longer range of 4,000 nautical miles (7,400 km; 4,600 mi) using the wings, landing gear, and central section from the MAX 9. The range of this aircraft would be closer to the Airbus A321LR, although with a smaller 150 seat capacity.

737 MAX 9

The 737 MAX 9 replaces the 737-900 and has a longer fuselage than the MAX 8. In 2016, Boeing planned to improve its range from 3,510 nautical miles (6,500 km; 4,040 mi) to 3,605 nmi (6,676 km; 4,149 mi) after 2021. Lion Air was the launch customer with an order for 201 in February 2012. It made its roll-out on March 7, 2017, and first flight on April 13, 2017; it took off from Renton Municipal Airport and landed at Boeing Field after a 2 hr 42 min flight. It was presented at the 2017 Paris Air Show.

Boeing 737 MAX 9 flight tests were scheduled to run through 2017, with 30% of the -8 tests repeated; aircraft 1D001 was used for auto-land, avionics, flutter, and mostly stability-and-control trials, while 1D002 was used for environment control system testing. It was certified by February 2018. Asian low-cost carrier Lion Air Group took delivery of the first MAX 9 on March 21, 2018, before entering service with Thai Lion Air. As the competing Airbus A321neo attracted more orders, the sale value of a 737 MAX 9, as of 2018, was the same as a MAX 8 at $53 million (~$63.4 million in 2023).

737 MAX 10

Loyal customers, such as Korean Air and United Airlines, pressed Boeing to develop a variant larger than the MAX 9 in order to compete with the Airbus A321neo, of which Boeing revealed studies in early 2016. As the Airbus A321neo had outsold the MAX 9 five-to-one, the proposed MAX 10 included a larger engine, stronger wings, and telescoping landing gear in mid-2016. In September 2016, it was reported that the variant would be simpler and lower-risk, with a modest stretch of 6–7 feet (1.83–2.13 m) for a length of 143–144 ft (43.6–43.9 m), seating 12–18 more passengers for 192–198 in a dual-class layout or 226-232 for a single class, needing an uprated 31,000 pounds-force (140 kN) LEAP-1B that could be available by 2019 or 2020, and would likely require a landing-gear modification to move the rotation point slightly aft.

In October 2016, Boeing's board of directors granted authority to offer the stretched variant with two extra fuselage sections forward and aft with a 3,100 nautical miles (5,700 km; 3,600 mi) range, reduced from the 3,300 nmi (6,100 km; 3,800 mi) range of the MAX 9. In early 2017, Boeing showed a 66 inches (1.7 m) stretch to 143 ft (44 m), enabling seating for 230 in a single class or 189 in two-class capacity, compared to 193 in two-class seating for the A321neo. The modest stretch of the MAX 10 enables the aircraft to retain the existing wing, and the Leap 1B engine from the MAX 9 with a trailing-link main landing gear as the only major change. Boeing 737 MAX Vice President and General Manager Keith Leverkuhn said the design had to be frozen in 2018, for a 2020 introduction.

Boeing hopes that 737 operators and 737 MAX customers like United Airlines, Delta Air Lines, Alaska Airlines, Air Canada, Lion Air, and Chinese airlines will be interested in the new variant. Boeing predicts a 5% lower trip cost and seat cost compared to the A321neo. Air Lease Corporation wants it a year sooner; its CEO John Pleuger stated, "It would have been better to get the first airplane in March 2019, but I don't think that's possible." AerCap CEO Aengus Kelly is cautious and said the -9 and -10 "will cannibalize each other".

The 737 MAX 10 was launched on June 19, 2017, with 240 orders and commitments from more than ten customers. United Airlines will be the largest 737 MAX 10 customer, converting 100 of their 161 orders for the MAX 9 into orders for the MAX 10. Boeing ended the 2017 Paris Air Show with 361 orders and commitments, including 214 conversions, from 16 customers, including 50 orders from Lion Air.

The variant configuration was firmed up by February 2018, and by mid-2018, the critical design review was completed. As of August 2018, assembly was underway with a first flight planned for late 2019. The semi-levered landing gear design has a telescoping oleo-pneumatic strut with a down-swinging lever to permit 9.5 inches (24 cm) taller gear. Driven by the existing retraction system, a shrink-link mechanical linkage mechanism at the top of the leg, inspired by carrier aircraft designs, allows the gear to be drawn in and shortened while being retracted into the existing wheel well. Entry into service was slated for July 2020.

On November 22, 2019, Boeing unveiled the first MAX 10 to employees in its Renton factory, Washington, scheduled for the first flight in 2020. At the time, 531 MAX 10s were on order, compared to the 3142 Airbus A321neos sold, capable of carrying 244 passengers or to fly up to 4,700 nautical miles (8,700 km; 5,400 mi) in its heaviest A321XLR variant. The MAX 10 has similar capacity as the A321XLR, but shorter range and much poorer field performance, greatly hindering its potential to service smaller airports as compared to the A321XLR.

By early 2021, Boeing expected 737 MAX 10 deliveries to start in 2023. The variant made its maiden flight on June 18, 2021, initiating its flight test and certification program.

On June 29, 2021, United Airlines placed an order for another 150 of the Boeing 737 MAX 10. These MAX 10 will replace a large number of United's older Boeing 757-200s. In January 2024, United CEO Kirby noted in an interview that the airline was in the process of developing plans that did not include the MAX 10 in its future fleet.

In September 2021, Ryanair failed to reach an agreement with Boeing over an order of MAX 10s, citing cost as a primary concern. However, in May 2023, Ryanair announced the order of 150 MAX 10s and an option to purchase a further 150.

In November 2022, Boeing Commercial Airplanes CEO Stanley Deal told investors at a conference that the MAX 10 was expected to enter service in 2024. By October 2023, deliveries were anticipated in early 2025.

Boeing Business Jet

The BBJ MAX 8 and BBJ MAX 9 are business jet variants of the 737 MAX 8 and 9, with new CFM LEAP-1B engines and advanced winglets providing 13% better fuel burn than the Boeing Business Jet; the BBJ MAX 8 has a 6,325 nautical miles (11,710 km; 7,280 mi) range, and the BBJ MAX 9 a 6,255 nmi (11,580 km) range. The BBJ MAX 7 was unveiled in October 2016, with a 7,000 nmi (12,960 km; 8,060 mi) range and 10% lower operating costs than the original BBJ, while being larger. The BBJ MAX 8 first flew on April 16, 2018, before delivery later the same year, and has a range of 6,640 nmi (12,300 km; 7,640 mi) with an auxiliary fuel tank.

Operators

As of October 2023, the five largest operators of the Boeing 737 MAX were Southwest Airlines (207), United Airlines (145), Ryanair Holdings (126), Alaska Airlines (62), and American Airlines (54).

Orders and deliveries

American Airlines was the first disclosed customer. By November 17, 2011, there were 700 commitments from nine customers, including Lion Air and SMBC Aviation Capital. By December 2011, the 737 MAX had 948 commitments and firm orders from thirteen customers. On September 8, 2014, Ryanair agreed to 100 firm orders with 100 options. In January 2017, aircraft leasing company GECAS ordered 75. By January 2019 the 737 MAX had 5,011 firm orders from 78 identified customers, with the top three being Southwest Airlines with 280, flydubai with 251, and Lion Air with 251. The first 737 MAX 8 was delivered to Malindo Air on May 16, 2017.

Following the groundings in March 2019, Boeing suspended all deliveries of 737 MAX aircraft, reduced production from 52 to 42 aircraft per month, and on December 16, 2019, announced that production would be suspended from January 2020 to conserve cash. At the time of the grounding, the 737 MAX had 4,636 unfilled orders valued at an estimated $600 billion. Boeing produced over 450 MAX aircraft awaiting delivery, about half of which are expected to be delivered in 2021, and the majority of the remainder in 2022. By November 30, 2020, at the time of the ungrounding, the unfilled orders stood at 4,039 aircraft. In November 2021, during the Dubai Airshow, Boeing received 72 firm orders from a new 737 MAX customer, India based Akasa Air, to be fulfilled over a 4-year period with first delivery in June 2022. In late January 2022 Boeing was working to clear the remaining inventory of 335 MAX aircraft and estimated most of them would be delivered by the end of 2023. In December 2022, the 1000th 737 MAX was delivered. In July 2023, Boeing first revealed the 737 MAX sub-type orders as follows: 2,751 MAX 8 (63%), 810 MAX 10 (19%), 344 MAX 200 (8%), 297 MAX 7 (7%), and 137 MAX 9 (3%). As of November 2024, the 737 MAX has 4,804 unfilled orders and 1,663 deliveries.

1. In 2018, there were 675 net orders for 737 program, of which 13 orders were for 737NG.
2. In 2019, there were 47 orders, but 183 cancellations of 737 MAX.
3. In 2020, there were 112 orders, but 641 cancellations of 737 MAX.
4. In 2021, there were 749 orders, but 374 cancellations of 737 MAX.

Cumulative Boeing 737 MAX orders and deliveries

 Orders

 Deliveries

As of November 2024

Accidents and incidents

As of 2023, the 737 MAX series had experienced 1.48 fatal hull loss accidents for every million takeoffs.

Lion Air Flight 610

On October 29, 2018, Lion Air Flight 610, a 737 MAX 8, crashed into the Java Sea 13 minutes after takeoff from Soekarno–Hatta International Airport, Jakarta, Indonesia. The flight was a scheduled domestic flight to Depati Amir Airport, Pangkal Pinang, Indonesia. All 189 people on board died. This was the first fatal aviation crash and first hull loss of a 737 MAX. The aircraft had been delivered to Lion Air two months earlier. People familiar with the investigation reported that during a flight piloted by a different crew on the day before the crash, the same aircraft experienced a similar malfunction but an extra pilot sitting in the cockpit jumpseat correctly diagnosed the problem and told the crew how to disable the malfunctioning MCAS flight-control system. Indonesia's National Transportation Safety Committee released its final report into the crash on October 25, 2019, attributing the crash to the MCAS pushing the aircraft into a dive due to data from a faulty angle-of-attack sensor. Following the Lion Air crash, Boeing issued an operational manual guidance, advising airlines on how to address erroneous cockpit readings.

Ethiopian Airlines Flight 302

On March 10, 2019, Ethiopian Airlines Flight 302, operated by a four-month-old 737 MAX 8, crashed approximately six minutes after takeoff from Addis Ababa, Ethiopia, on a scheduled flight to Nairobi, Kenya, killing all 149 passengers and 8 crew members. The cause of the crash was initially unclear, though the aircraft's vertical speed after takeoff was reported to be unstable. Evidence retrieved on the crash site suggests, that at the time of the crash, the aircraft was configured to dive, similar to Lion Air Flight 610. The similarity of the physical and flight data evidence from the accidents led to the global 737 MAX groundings beginning on the day of the second accident.

Alaska Airlines Flight 1282

On January 5, 2024, Alaska Airlines Flight 1282, a 737 MAX 9, suffered an uncontrolled decompression shortly after takeoff from Portland International Airport. The MAX 9, like the 737-900ER, features a rear mid-cabin exit door on each side behind the wings that is required when used with dense seating configurations. On less densely configured aircraft, those exit doors are not required and door plugs are installed in their place, as was the case on this aircraft. During the climb, a door plug blew out, causing the decompression.

The plane returned to Portland, and there were no fatalities or significant injuries among the 171 passengers and 6 crew on board. Some small personal belongings, along with cabin trim such as seat covers and headrests, were sucked out of the opening. According to some passengers, a child seated nearby had his shirt pulled off and sucked out of the aircraft while his mother held him. The FAA, Boeing, Alaska Airlines, and the NTSB quickly acknowledged the accident and an investigation was launched. As a precautionary measure, Alaska Airlines grounded their 737 MAX 9 fleet. Hours later, the FAA ordered the grounding and inspection of 171 aircraft from the global 737 MAX 9 fleet with similar configuration to the incident aircraft, along with corrective action if necessary. Alaska Airlines and United Airlines both reported finding loose door plug bolts on some of the aircraft inspected.

On February 5, 2024, the NTSB said in its preliminary report that the four key bolts that should have secured the door plug were not installed on delivery to Alaska Airlines because Boeing had opened the door plug at its Renton factory to repair damaged rivets, then failed to secure it.

Southwest Airlines Flight 746

In May 2024, US authorities were investigating an incident which occurred on Southwest Airlines Flight 746 from Phoenix to Oakland. The 737 MAX 8 airliner experienced Dutch roll and some damage to the rudder standby power control unit was reported.

Specifications

1. Includes 737 MAX 200
2. When configured as 737 MAX 8
3. When configured as 737 MAX 200
4. With eight auxiliary center fuel tanks: 10,921 US gal (41,340 L) – 73,171 lb (33,190 kg)
5. MAX 200: 2,700 nmi (5,000 km; 3,100 mi)

See also

• Financial impact of the Boeing 737 MAX groundings

• Competition between Airbus and Boeing

Related development

• Boeing 737 Next Generation
• Boeing Business Jet

Aircraft of comparable role, configuration, and era

• Airbus A220-300
• Airbus A320neo family
• Comac C919
• Yakovlev MC-21

Notes

1. Production halted between January and late May 2020

References

1. ^ "Boeing: Orders and Deliveries (updated monthly)". Boeing. November 30, 2024. Archived from the original on January 12, 2021. Retrieved December 10, 2024.
2. ^ Hemmerdinger, Jon (May 27, 2020). "Boeing restarts 737 Max production". Flightglobal. Archived from the original on June 6, 2020. Retrieved May 29, 2020.
3. "Production begins on first 737 MAX parts". Boeing Commercial Airplanes. October 13, 2014. Archived from the original on February 3, 2016. Retrieved January 29, 2016.
4. ^ Hashim, Firdaus (May 22, 2017). "Malindo operates world's first 737 Max flight". FlightGlobal. Archived from the original on November 13, 2018. Retrieved May 22, 2017.
5. ^ Gates, Dominic (January 29, 2016). "Boeing's 737 MAX takes wing with new engines, high hopes". The Seattle Times. Archived from the original on April 9, 2019. Retrieved January 29, 2016.
6. "The US is increasingly alone in not grounding the Boeing 737 Max". Quartz. March 13, 2019. Archived from the original on July 9, 2022. Retrieved September 12, 2022.
7. ^ "FAA clears Boeing 737 Max to fly again 20 months after grounding over deadly crashes". November 18, 2020. Archived from the original on November 18, 2020. Retrieved November 18, 2020.
8. Isidore, Chris (November 17, 2020). "Boeing's 737 Max debacle could be the most expensive corporate blunder ever". CNN. Archived from the original on December 21, 2020. Retrieved December 21, 2020.
9. ^ Gates, Dominic (November 18, 2020). "Boeing 737 MAX can return to the skies, FAA says". Archived from the original on November 30, 2020. Retrieved November 18, 2020.
10. ^ "Boeing Charged with 737 Max Fraud Conspiracy and Agrees to Pay over $2.5 Billion" (Press release). The United States Department of Justice. January 7, 2021. Archived from the original on January 8, 2021. Retrieved January 8, 2021.
11. ^ Gates, Dominic; Kamb, Lewis (January 7, 2021). "Boeing agrees to pay $2.5B+ to settle criminal fraud charges over 737 MAX". The Seattle Times. Archived from the original on January 10, 2021. Retrieved January 8, 2021.
12. ^ "FAA and Boeing manipulated 737 Max tests during recertification". The Verge. December 18, 2020. Archived from the original on July 10, 2022. Retrieved August 25, 2022.
13. Walker, Mark (March 12, 2024). "F.A.A. Audit of Boeing's 737 Max Production Found Dozens of Issues". The New York Times – via NYTimes.com.
14. "Boeing firms up 737 replacement studies by appointing team". Flight International. FlightGlobal. March 3, 2006. Archived from the original on October 14, 2016. Retrieved July 17, 2016.
15. Hamilton, Scott (June 24, 2010). "737 decision may slip to 2011: Credit Suisse". Flight International. FlightGlobal. Archived from the original on October 8, 2017. Retrieved May 14, 2017.
16. "Airbus offers new fuel saving engine options for A320 Family". Airbus (Press release). December 1, 2010. Archived from the original on April 9, 2016. Retrieved May 14, 2017.
17. Freed, Joshua (February 10, 2011). "Boeing CEO: 'new airplane' to replace 737". NBC News. Associated Press. Archived from the original on August 14, 2017. Retrieved August 14, 2017.
18. Sanders, Peter; Cameron, Doug (January 26, 2011). "Boeing Confident on Deliveries This Year". Wall Street Journal. ISSN 0099-9660. Retrieved November 16, 2023.
19. Ostrower, John (September 24, 2010). "Boeing patent may provide glimpse into 737 replacement plan". FlightGlobal. Archived from the original on October 6, 2014. Retrieved November 16, 2023.
20. "Most airlines taking cautious approach to next gen aircraft". CAPA Centre for Aviation. April 11, 2011. Archived from the original on November 7, 2017. Retrieved November 3, 2017.
21. "Airbus with new order record at Paris Air Show 2011". Airbus (Press release). June 23, 2011. Archived from the original on March 17, 2017. Retrieved May 14, 2017.
22. Clark, Nicola (July 20, 2011). "Jet Order by American is a Coup for Boeing's Rival". The New York Times. Archived from the original on June 18, 2018. Retrieved March 12, 2019.
23. "AMR Corporation Announces Largest Aircraft Order in History With Boeing and Airbus". American Airlines (Press release). July 20, 2011. Archived from the original on April 30, 2019. Retrieved April 30, 2019.
24. Ostrower, Jon (February 19, 2012). "Boeing says 737 Max to meet or exceed A320neo range". Air Transport Intelligence News. FlightGlobal. Archived from the original on February 17, 2012. Retrieved February 20, 2012.
25. "Boeing Launches 737 New Engine Family with Commitments for 496 Airplanes from Five Airlines" (Press release). Boeing. August 30, 2011. Archived from the original on October 4, 2015. Retrieved May 14, 2017.
26. ^ Ostrower, Jon (August 30, 2011). "More details emerge on configuration of re-engined 737". Flight International. FlightGlobal. Archived from the original on March 30, 2019. Retrieved September 5, 2011.
27. O'Keeffe, Niall (September 12, 2011). "Caution welcomed: Boeing's 737 Max". Flight International. Archived from the original on December 30, 2013. Retrieved May 16, 2013.
28. Ostrower, Jon (November 7, 2011). "Boeing completes initial review of 737 Max configuration". Air Transport Intelligence News. FlightGlobal. Archived from the original on November 8, 2011. Retrieved November 7, 2011.
29. Hamilton, Scott (January 27, 2012). "Boeing disputes 737 Max development cost report". Air Transport Intelligence News. FlightGlobal. Archived from the original on October 8, 2017. Retrieved May 11, 2017.
30. Hamilton, Scott (October 7, 2019). "Pontifications: Muilenburg's departure wouldn't go far enough". Leeham News. Archived from the original on October 7, 2019. Retrieved October 7, 2019.
31. ^ George, Fred (May 12, 2017). "Pilot Report: Flying the 737-8, Boeing's New Narrowbody Breadwinner". Aviation Week & Space Technology. Archived from the original on May 12, 2017. Retrieved May 12, 2017.
32. "First Firm Order for 737 MAX", Aviation News, February 2012, p. 5
33. Carvalho, Stanley (November 5, 2014). "Boeing plans to develop new airplane to replace 737 MAX by 2030". Reuters. Archived from the original on October 21, 2017. Retrieved June 30, 2017.
34. "Boeing plans to develop new airplane to replace 737 MAX by 2030". Reuters. November 5, 2014. Archived from the original on October 30, 2017. Retrieved January 24, 2020.
35. Guy Norris and Jens Flottau (December 12, 2014). "Boeing Revisits Past In Hunt For 737/757 Successors". Aviation Week & Space Technology. Archived from the original on December 14, 2014. Retrieved December 14, 2014.
36. Siebenmark, Jerry (August 13, 2015). "Spirit AeroSystems completes first Boeing 737 Max fuselage". Wichita Eagle. Archived from the original on August 17, 2015. Retrieved August 13, 2015.
37. Gates, Dominic (December 8, 2015). "Boeing unveils the first 737 MAX and its new production line". The Seattle Times. Archived from the original on January 5, 2016. Retrieved December 9, 2015.
38. DeMay, Daniel (December 8, 2015). "Photos: Boeing rolls out new 737 MAX 8 airplane". Seattle Post-Intelligencer. Archived from the original on December 9, 2015. Retrieved December 9, 2015.
39. "Max Makes Debut" Airliner World February 2016 p. 5.
40. Trimble, Stephen (December 1, 2016). "First redesigned thrust reverser delivered for 737 Max". FlightGlobal. Archived from the original on April 11, 2017. Retrieved April 10, 2017.
41. ^ Norris, Guy (February 15, 2017). "In Pictures: First Boeing 737-9 Noses Toward Rollout". Aviation Week & Space Technology. Archived from the original on February 15, 2017. Retrieved February 16, 2017.
42. Trimble, Stephen (April 10, 2017). "Boeing prepares for unprecedented 737 Max ramp-up". FlightGlobal. Archived from the original on April 11, 2017. Retrieved April 10, 2017.
43. Gates, Dominic (February 14, 2017). "Boeing ramps up automation, innovation as it readies 737MAX". The Seattle Times. Archived from the original on January 29, 2020. Retrieved January 29, 2020.
44. Gates, Dominic (April 18, 2015). "Boeing retools Renton plant with automation for 737's big ramp-up". The Seattle Times. Archived from the original on July 27, 2020. Retrieved January 29, 2020.
45. Gates, Dominic (August 2, 2018). "Boeing's 737 ramp-up slows as unfinished planes pile up in Renton". The Seattle Times. Archived from the original on August 3, 2018. Retrieved August 3, 2018.
46. Gates, Dominic (October 9, 2018). "Boeing finally begins to reduce its 737 delivery backlog Originally". The Seattle Times. Archived from the original on October 12, 2018. Retrieved October 11, 2018.
47. "Boeing-Hosts-China-President-Xi-Jinping-Announces-Airplane-Sales-Expanded-Collaboration-with-Chinas-Aviation-Industry" (Press release). Boeing. September 23, 2015. Archived from the original on November 14, 2017. Retrieved December 17, 2018.
48. "Boeing to build plant in Zhoushan". Shanghai Daily. March 14, 2017. Archived from the original on March 6, 2020. Retrieved January 10, 2020.
49. Thompson, Loren. "Boeing To Build Its First Offshore Plane Factory In China As Ex-Im Bank Withers". Forbes. Archived from the original on August 24, 2019. Retrieved September 23, 2015.
50. "Pictures: Boeing delivers first China-completed 737 Max". FlightGlobal. December 15, 2018. Archived from the original on December 16, 2018. Retrieved December 17, 2018.
51. Michaels, Kevin (January 27, 2020). "MAX production shutdown". Aviation Week & Space Technology. p. 12.
52. "A16WE type data sheet" (PDF). The Boeing 737 Technical Site. November 9, 2020.
53. "Supplemental Type Certificates". Federal Aviation Administration.
54. "Original Design Approval Process". Federal Aviation Administration.
55. ^ Gates, Dominic (March 17, 2019). "Flawed analysis, failed oversight: How Boeing, FAA certified the suspect 737 MAX flight control system". The Seattle Times. Archived from the original on March 20, 2021. Retrieved March 18, 2019.
56. ^ Goold, Ian (November 8, 2017). "Boeing Forges Ahead with Flight-test Campaigns". AIN. Archived from the original on November 13, 2017. Retrieved November 13, 2017.
57. ^ "Type Certificate Data Sheet No. A16WE" (PDF). FAA. March 8, 2017. Archived (PDF) from the original on November 13, 2017. Retrieved May 16, 2017.
58. "Boeing 737 MAX 8 Earns FAA Certification". Boeing. March 9, 2017. Archived from the original on March 30, 2019. Retrieved March 30, 2019.
59. "Type Certificate Data Sheet No.: IM.A.120" (PDF). EASA. March 27, 2017. Archived from the original (PDF) on March 30, 2019. Retrieved March 14, 2019.
60. Karp, Aaron (May 10, 2017). "Boeing suspends 737 MAX flights, cites 'potential' CFM LEAP-1B issue". Air Transport World. Aviation Week Network. Archived from the original on February 18, 2019. Retrieved May 11, 2017.
61. ^ Trimble, Stephen (May 16, 2017). "Boeing delivers first 737 Max". FlightGlobal. Archived from the original on December 29, 2018. Retrieved May 17, 2017.
62. Trimble, Stephen (May 12, 2017). "Boeing resumes 737 Max 8 test flights". FlightGlobal. Archived from the original on March 30, 2019. Retrieved May 14, 2017.
63. Robison, Peter; Levin, Alan (March 18, 2019). "Boeing Drops as Role in Vetting Its Own Jets Comes Under Fire". Fortune. Bloomberg. Archived from the original on March 19, 2019. Retrieved March 18, 2019.
64. Stieb, Matt (March 17, 2019). "Report: The Regulatory Failures of the Boeing 737 MAX". New York. Archived from the original on March 20, 2019. Retrieved March 21, 2019.
65. Moores, Victoria (July 18, 2017). "Norwegian performs first transatlantic 737 MAX flight". Aviation Week Network. Penton. Archived from the original on July 18, 2017. Retrieved July 19, 2017.
66. Waldron, Greg (April 13, 2017). "Boeing optimistic for early 737 Max dispatch reliability". FlightGlobal. Archived from the original on April 13, 2017. Retrieved April 13, 2017.
67. Schlangenstein, Mary; Johnsson, Julie (August 30, 2017). "Southwest Quietly Takes Delivery of Its First Boeing 737 Max". Bloomberg. Archived from the original on August 30, 2017. Retrieved August 30, 2017.
68. Austen, Ian; Gebrekidan, Selam (March 13, 2019). "Trump Announces Ban of Boeing 737 Max Flights". The New York Times. Archived from the original on September 13, 2019.
69. Laris, Michael (June 19, 2019). "Changes to flawed Boeing 737 Max were kept from pilots, DeFazio says". The Washington Post. Archived from the original on December 5, 2020.
70. Gates, Dominic (October 25, 2019). "FAA shuts down Florida repair firm that supplied faulty Lion Air sensor on Boeing 737 MAX". The Seattle Times. Retrieved February 20, 2024.
71. ^ Gates, Dominic (January 6, 2023). "Final report on Boeing 737 MAX crash sparks dispute over pilot error". The Seattle Times. Retrieved February 20, 2024.
72. Nicas, Jack; Kitroeff, Natalie; Gelles, David; Glanz, James (June 1, 2019). "Boeing Built Deadly Assumptions Into 737 Max, Blind to a Late Design Change". The New York Times.
73. FAA Has Completed 737 MAX Return to Service Efforts, but Opportunities Exist To Improve the Agency's Risk Assessments and Certification Processes (PDF). U.S Department of Transportation Office of Inspector General (Report). April 26, 2023. pp. 22–23. Retrieved February 24, 2024.
74. Suhartono, Muktita; Ramzy, Austin (October 25, 2019). "Indonesian Report on Lion Air Crash Finds Numerous Problems". The New York Times. Retrieved February 25, 2024.
75. Gates, Dominic; Kamb, Lewis (October 24, 2019). "Indonesia's devastating final report blames Boeing 737 MAX design, certification in Lion Air crash". The Seattle Times. Retrieved February 25, 2024.
76. Jolly, Jasper (October 25, 2019). "Lion Air crash report 'criticises design, maintenance and pilot error'". The Guardian. ISSN 0261-3077. Retrieved February 24, 2024.
77. "Debris found in fuel tanks of 70% of inspected 737 Max jets". Associated Press. February 22, 2020. Archived from the original on February 24, 2020. Retrieved February 24, 2020 – via ABC News.
78. "Boeing 737-8 and 737-9 Airplanes: Return to Service" (PDF). Federal Aviation Administration. November 18, 2020. Archived (PDF) from the original on November 18, 2020. Retrieved November 19, 2020.
79. ^ "Statement from Boeing CEO Dennis Muilenburg: We Own Safety – 737 MAX Software, Production and Process Update" (Press release). Boeing. April 5, 2019. Archived from the original on April 6, 2019. Retrieved April 6, 2019.
80. Bruno, Michael; Dubois, Thierry (April 11, 2019). "Leap-1B Eyes Catch Up as 737 Production Slows". MRO Network. Archived from the original on April 11, 2019. Retrieved April 11, 2019.
81. ^ "Boeing Statement Regarding 737 MAX Production" (Press release). Boeing. December 16, 2019. Archived from the original on December 17, 2019. Retrieved December 16, 2019.
82. "Boeing has temporarily stopped making 737 Max airplanes". CNN. January 21, 2020. Archived from the original on April 14, 2020. Retrieved April 8, 2020.
83. "Boeing's jet deliveries slide as 737 Max grounding takes a toll". Los Angeles Times. July 9, 2019. Archived from the original on February 24, 2020. Retrieved February 24, 2020.
84. Johnson, Eric M.; Hepher, Tim (December 18, 2019). "Boeing 737 MAX freeze divides suppliers into haves and have-nots". Reuters. Archived from the original on January 11, 2020. Retrieved January 17, 2020.
85. ^ "Moody's cuts Boeing's debt ratings as 737 MAX problems deepen". Reuters. December 18, 2019. Archived from the original on January 25, 2020. Retrieved January 24, 2020.
86. McCoy, Daniel (December 31, 2019). "Moody's downgrades aerospace outlook due to 737 MAX". Wichita Business Journal. Archived from the original on May 27, 2021. Retrieved February 1, 2020.
87. Root, Al (January 3, 2020). "The Boeing 737 MAX Could Have a New Problem---Not Enough Engines". Barron's. Archived from the original on January 8, 2020. Retrieved January 8, 2020.
88. Hamilton, Scott (January 7, 2020). "Exclusive: Boeing, internally, sees production halt at least 60 days". Leeham News. Archived from the original on January 7, 2020.
89. McCoy, Daniel (January 15, 2020). "Analyst sees 737 MAX production restarting at fewer than 20 aircraft per month". Wichita Business Journals. Archived from the original on September 16, 2020. Retrieved February 1, 2020.
90. Bogaisky, Jeremy (April 6, 2020). "Boeing Moves To Completely Shut Down Airliner Production". Forbes. Archived from the original on June 5, 2020. Retrieved April 8, 2020.
91. "Regulator test flight of Boeing 737 MAX delayed to May: sources". RFI. April 7, 2020. Archived from the original on April 8, 2020. Retrieved April 8, 2020.
92. "Boeing addresses new 737 MAX software issue that could keep plane grounded longer". Reuters. January 17, 2020. Archived from the original on September 15, 2020. Retrieved January 17, 2020.
93. "Boeing Statement on 737 MAX Return to Service". MediaRoom (Press release). January 21, 2020. Archived from the original on May 29, 2020.
94. Shepardson, David (April 28, 2020). "Boeing 737 MAX expected to remain grounded until at least August: sources". Reuters. Archived from the original on June 3, 2020. Retrieved May 27, 2020.
95. "FAA Updates on Boeing 737 MAX". faa.gov. July 1, 2020. Archived from the original on September 1, 2019. Retrieved July 2, 2020.
96. Genovese, Daniella (December 3, 2020). "Journalists board American Airlines Boeing 737 Max in first public flight since grounding". FOXBusiness. Archived from the original on December 3, 2020. Retrieved December 4, 2020.
97. "Boeing 737 Max: Brazilian airline resumes passenger flights". BBC News. December 9, 2020. Archived from the original on December 9, 2020. Retrieved December 9, 2020.
98. Wallace, Gregory (December 29, 2020). "Boeing's troubled 737 Max is back in the air after nearly two years". CNN Business. Archived from the original on December 31, 2020. Retrieved December 31, 2020.
99. "Transport Canada introduces additional requirements to allow for the return to service of the Boeing 737 MAX" (Press release). Transport Canada. January 18, 2021. Archived from the original on January 28, 2021. Retrieved January 28, 2021.
100. "Boeing 737 Max cleared to fly in Europe after crashes". BBC News. January 27, 2021. Archived from the original on January 28, 2021. Retrieved January 28, 2021.
101. "DGCA 26 August 2021". August 27, 2021. Archived from the original on August 27, 2021. Retrieved August 27, 2021.
102. "EASA drafts 737 MAX return conditions, differences with FAA". November 25, 2020. Archived from the original on June 1, 2022. Retrieved April 10, 2022.
103. "Innovative booking tool allows travelers to avoid flying on 'terrifying' 737 MAX planes: 'If it's Boeing, I'm not going'". March 14, 2024.
104. Hamilton, Scott (January 29, 2020). "Boeing MAX production will restart, build slowly". Leeham News. Archived from the original on January 30, 2020.
105. Hemmerdinger, Jon (January 29, 2020). "Boeing will need a 'few years' to recapture previous 737 Max production rate plans". Flight Global. Archived from the original on February 1, 2020. Retrieved February 1, 2020.
106. Kilgore, Tomi (January 30, 2020). "Spirit AeroSystems to restart 737 MAX planes 'slowly,' won't hit 52/month production rate for more than 2 years". MarketWatch. Archived from the original on February 1, 2020.
107. ^ agencies, Guardian staff and (August 20, 2020). "Boeing publicises new name for 737 Max planes after crashes". the Guardian. Archived from the original on August 20, 2020. Retrieved August 21, 2020.
108. "Boeing Formally Restarts 737 MAX Production | Aviation Week Network". Archived from the original on September 14, 2022. Retrieved May 28, 2020.
109. ^ Hemmerdinger, Jon (October 28, 2020). "Boeing revises 2021 737 Max delivery pace, reflecting depressed demand". Flight Global. Archived from the original on October 31, 2020. Retrieved October 29, 2020.
110. "U.S. ends Boeing 737 MAX flight ban after crash probes". November 18, 2020. Archived from the original on November 18, 2020. Retrieved November 18, 2020.
111. ^ Eric M. Johnson and Tim Hepher (March 5, 2022). "EXCLUSIVE Boeing aims to nearly double 737 MAX production by end-2023 -sources". Reuters. Archived from the original on March 5, 2022. Retrieved March 5, 2022.
112. "Boeing says 737 production hit 31-per-month rate in June as backlog jumps". FflightGlobal. July 12, 2022. Archived from the original on July 12, 2022. Retrieved July 13, 2022.
113. Hemmerdinger, Jon (September 16, 2022). "Boeing still pausing 737 production as it works through supply troubles". Flight Global.
114. Ostrower, Jon (January 30, 2023). "Boeing to open 737 Max line at Everett plant". The Air Current. Retrieved January 30, 2023.
115. Gates, Dominic (January 30, 2023). "Boeing to set up a fourth 737 MAX assembly line in Everett". The Seattle Times. Retrieved January 30, 2023.
116. Gates, Dominic; Rosenblatt, Lauren (January 24, 2024). "FAA blocks Boeing production push but clears way for MAX 9s to fly again". The Seattle Times. Retrieved January 28, 2024.
117. Josephs, Leslie (January 24, 2024). "FAA halts Boeing 737 Max production expansion, but clears path to return Max 9 to service". CNBC. Retrieved January 28, 2024.
118. "FAA Orders Halt To Boeing 737 MAX Production Growth Plan | Aviation Week Network". aviationweek.com. Retrieved January 28, 2024.
119. Dominic Gates (March 9, 2022). "Boeing may ask Congress to extend MAX 10 exemption from safety rule". The Seattle Times. Archived from the original on March 9, 2022. Retrieved March 9, 2022.
120. ^ Hemmerdinger, Jon (November 2, 2022). "Boeing pushes back 737 Max 7 and Max 10 certifications". Flight Global. Retrieved December 23, 2022. Boeing has again delayed certification timelines for its two outstanding 737 Max variants, now estimating the Federal Aviation Administration will clear the Max 7 by early 2023 and the Max 10 by early 2024.
121. Hemmerdinger, Jon (December 1, 2022). "Top US lawmakers to decide fate of 737 Max 7 and Max 10 regulatory exemption". Flight Global.
122. Hemmerdinger, Jon (December 8, 2022). "Congress excludes Max 7 and 10 exemption from defence spending bill". Flight Global.
123. "Congress clears FAA to certify Boeing 737 MAX 7, MAX 10 unchanged". The Seattle Times. December 19, 2022. Retrieved December 21, 2022.
124. "If Congress doesn't mandate Boeing 737 MAX safety retrofits, Europe will". The Seattle Times. December 2, 2022. Retrieved December 21, 2022.
125. "Over pilots' objection, Boeing seeks safety exemption for MAX 7". The Seattle Times. January 5, 2024. Retrieved February 25, 2024.
126. ^ Shepardson, David; Insinna, Valerie; Hepher, Tim (January 30, 2024). "Boeing to withdraw MAX 7 exemption request as safety scrutiny intensifies". Reuters. Retrieved February 25, 2024.
127. Ostrower, Jon (February 29, 2024). "737 Max anti-ice system fix is slow going". The Air Current. Retrieved February 29, 2024.
128. Koenig, David (January 23, 2024). "At United and Alaska airlines, frustration with Boeing's manufacturing problems is boiling over". AP News. Retrieved February 26, 2024.
129. Hepher, Tim; Singh, Kumar (January 29, 2024). "United CEO kickstarts Airbus talks amid Boeing delays, sources say". Reuters. Retrieved February 25, 2024.
130. Trimble, Stephen (June 15, 2017). "737 Max cutaway and technical description". FlightGlobal. Archived from the original on June 15, 2017. Retrieved June 15, 2017.
131. "Boeing: The most efficient winglet on any airplane". boeing.com. Archived from the original on November 26, 2021. Retrieved November 26, 2021.
132. ^ Norris, Guy (December 2, 2013). "Laminar Flow Boosts 737 MAX Long-Range Performance". Aviation Week & Space Technology. Archived from the original on June 5, 2016. The configuration is designed to maximize lift for a wingspan restricted to the same Category C-sized gates as current 737s.
133. ^ Herbert, Joseph (2020). The Boeing 737 MAX: Lessons for Engineering Ethics. Dordrecht: Springer Netherlands. pp. 2957–2974.
134. Rockwell Collins (November 15, 2012). "Rockwell Collins wins Boeing 737 MAX contract for large-format flight displays" (Press release). Archived from the original on February 17, 2017. Retrieved February 16, 2017 – via Businesswire.
135. "Boeing aims to minimise 737 Max changes". Air Transport Intelligence News. FlightGlobal. August 31, 2011. Archived from the original on December 4, 2018. Retrieved February 16, 2017.
136. Lemme, Peter (October 28, 2019). "Flawed Assumptions Pave a Path to Disaster". Archived from the original on November 2, 2019. Retrieved November 2, 2019.
137. Ostrower, Jon (November 13, 2018). "What is the Boeing 737 Max Maneuvering Characteristics Augmentation System". The Air Current. Archived from the original on April 7, 2019. Retrieved June 11, 2019.
138. "Boeing's MCAS may not have been needed on the 737 Max at all". The Air Current. January 10, 2021. Archived from the original on January 10, 2021. Retrieved January 10, 2021.
139. "Boeing Introduces 737 MAX With Launch of New Aircraft Family" (Press release). Boeing. August 30, 2011. Archived from the original on August 20, 2017. Retrieved May 14, 2017.
140. "CFM56-7B". Safran. June 1, 2015. Archived from the original on March 30, 2019. Retrieved June 14, 2018.
141. Ostrower, Jon (August 31, 2011). "Boeing narrows 737 Max engine fan size options to two". FlightGlobal. Archived from the original on March 27, 2019. Retrieved May 14, 2017.
142. Ostrower, Jon (November 3, 2011). "Boeing reveals 737 Max configuration details". FlightGlobal. Archived from the original on December 22, 2018. Retrieved March 26, 2019.
143. "Boeing cites 600 commitments for revamped 737". Reuters. November 3, 2011. Archived from the original on December 4, 2018. Retrieved June 30, 2017.
144. Ostrower, Jon (May 17, 2012). "Boeing Tweaks Engine for New 737 Max". The Wall Street Journal. Archived from the original on December 5, 2018. Retrieved August 3, 2017.
145. Nicas, Jack; Kitroeff, Natalie; Gelles, David; Glanz, James (June 1, 2019). "Boeing Built Deadly Assumptions Into 737 Max, Blind to a Late Design Change". The New York Times. ISSN 0362-4331. Archived from the original on June 1, 2019. Retrieved July 27, 2019.
146. Polek, Gregory (November 13, 2011). "Boeing Takes Minimalist Approach to 737 MAX". Aviation International News. Archived from the original on November 7, 2018. Retrieved May 14, 2017.
147. Trimble, Stephen (July 23, 2013). "Boeing locks in 737 Max 8 configuration". FlightGlobal. Archived from the original on April 9, 2019. Retrieved March 26, 2019.
148. Tinseth, Randy (May 22, 2018). "737 MAX: a year of serving the globe". Boeing. Archived from the original on May 23, 2018. Retrieved May 22, 2018.
149. Zhang, Benjamin (March 13, 2019). "Here's how much Boeing is estimated to make on each 737 Max 8 plane". Business Insider. Archived from the original on March 6, 2020. Retrieved January 23, 2020.
150. "Boeing Stock Falls As Trump, FAA Ground Boeing 737 Max Jets In U.S. | Investor's Business Daily". Investor's Business Daily. March 14, 2019. Archived from the original on January 31, 2020. Retrieved January 31, 2020.
151. Polek, Gregory (January 29, 2020). "Amid Big Losses, Boeing To 'Reassess' NMA, Cut 787 Rate". Aviation International News. Archived from the original on January 31, 2020. Retrieved January 31, 2020.
152. "Boeing to Recognize Charge and Increased Costs in Second Quarter Due to 737 MAX Grounding – Jul 18, 2019". MediaRoom. Archived from the original on May 19, 2020. Retrieved January 31, 2020.
153. Hemmerdinger, Jon (January 29, 2020). "Boeing estimates 737 Max crisis will cost $18.6 billion". Flight Global. Archived from the original on January 29, 2020. Retrieved February 2, 2020.
154. ^ "Boeing Commercial Airplanes – Orders and Deliveries – 737 Model Summary". Boeing. October 2018. Archived from the original on November 21, 2018. Retrieved February 12, 2021.
155. Ostrower, Jon (August 30, 2011). "Boeing designates 737 MAX family". Air Transport Intelligence News. FlightGlobal. Archived from the original on September 25, 2011. Retrieved August 31, 2011.
156. ^ "Boeing Delivers First 737 MAX 9" (Press release). Boeing. March 21, 2018. Archived from the original on September 11, 2020. Retrieved March 22, 2018.
157. ^ "Ryanair Takes Delivery Of 1st Boeing 737 "Gamechanger" Aircraft – Ryanair's Corporate Website". corporate.ryanair.com. June 16, 2021. Archived from the original on June 21, 2022. Retrieved June 21, 2022.
158. Insinna, Valerie; Shepardson, David (July 26, 2023). "First delivery of Boeing 737 MAX 7 delayed to 2024". Reuters. Retrieved November 13, 2023.
159. Kingsley-Jones, Max (February 7, 2018). "Detailed design starts on 737 Max 10". FlightGlobal. Archived from the original on February 12, 2018. Retrieved February 11, 2018.
160. "Farnborough: Boeing's Execution on 737 MAX Sparkles as MAX 7.5 and MAX 10X Loom". Airways Magazine. July 10, 2016. Archived from the original on July 11, 2016. Retrieved July 17, 2016.
161. "Boeing confirms 737 Max 7 redesign". FlightGlobal. July 11, 2016. Archived from the original on November 29, 2019. Retrieved July 11, 2016.
162. "Boeing Upscales 737-700". Aviation International News. July 12, 2016. Archived from the original on May 27, 2021. Retrieved July 13, 2016.
163. ^ Norris, Guy (March 16, 2018). "Boeing Begins 737-7 Flight Test Program". Aviation Week Network. Archived from the original on October 17, 2018. Retrieved March 20, 2018.
164. ^ Trimble, Stephen (October 4, 2017). "Boeing starts building first 737 Max 7". FlightGlobal. Archived from the original on May 10, 2019. Retrieved October 5, 2017.
165. Trimble, Stephen (November 23, 2017). "Boeing starts assembling first Max 7". FlightGlobal. Archived from the original on December 1, 2017. Retrieved November 23, 2017.
166. Gates, Dominic (February 5, 2018). "Boeing debuts MAX 7 jet, smallest and slowest-selling of its 737 MAX family". The Seattle Times. Archived from the original on February 5, 2018. Retrieved February 6, 2018.
167. "Boeing 737 Max 7 narrowbody jetliner makes maiden flight". Reuters. March 16, 2018. Archived from the original on March 16, 2018. Retrieved March 16, 2018.
168. Trimble, Stephen (March 16, 2018). "Boeing launches 737 Max 7 into flight testing". FlightGlobal. Archived from the original on March 17, 2018. Retrieved March 17, 2018.
169. Josephs, Leslie (March 29, 2021). "Southwest Airlines agrees to buy 100 of Boeing's smallest 737 Max model". CNBC. Archived from the original on August 31, 2021. Retrieved September 22, 2021.
170. Bertoletti, Mario (June 8, 2021). "Southwest Airlines Orders 34 Boeing 737 MAX 7". Airways Magazine. Archived from the original on September 22, 2021. Retrieved September 22, 2021.
171. "Canada's WestJet defers maiden B737 MAX 7 to 2021". ch-aviation. August 1, 2018. Archived from the original on June 8, 2019. Retrieved June 8, 2019.
172. "Southwest Airlines Reports Second Quarter 2022 Results". Southwest Airlines Newsroom (Press release). July 28, 2022. Archived from the original on September 14, 2022.
173. Josephs, Leslie (January 25, 2024). "Southwest Airlines takes Boeing Max 7 out of 2024 plans because of certification delays". CNBC. Retrieved February 26, 2024.
174. "Southwest prepared to wait for delayed Boeing MAX 7s, executive says". Reuters. January 30, 2024. Retrieved February 25, 2024.
175. ^ "Boeing plans performance upgrade for 737 Max after 2021". FlightGlobal. October 31, 2016. Archived from the original on November 1, 2016. Retrieved October 31, 2016.
176. "Boeing Completes 737 MAX 8 Firm Configuration" Archived September 23, 2015, at the Wayback Machine. Boeing, July 23, 2013.
177. "737 MAX 8 performs first international flight". AeroLatin News. May 3, 2016. Archived from the original on April 8, 2019. Retrieved March 12, 2019.
178. "End of Line B737-800 Values Show Fatigue". Aircraft Value News. September 17, 2018. Archived from the original on September 17, 2018. Retrieved September 17, 2018.
179. "Boeing Launches 737 MAX 200 with Ryanair - Sep 8, 2014". September 9, 2014. Archived from the original on September 9, 2014. Retrieved January 19, 2024.
180. "Ryanair Places Its Biggest Boeing Order for up to 300 737 MAX Jets". Boeing. May 9, 2023. Retrieved January 18, 2024.
181. "Boeing Launches 737 MAX 200 with Ryanair" (Press release). Boeing. September 8, 2014. Archived from the original on September 9, 2014. Retrieved September 10, 2014.
182. Gates, Dominic (September 8, 2014). "Ryanair makes big order for 737 MAX jets that can carry 200". The Seattle Times. Archived from the original on May 12, 2019. Retrieved January 18, 2017.
183. "Update 5-Ryanair buys 100 Boeing 737 MAX jets, sees fare price war". Reuters. September 8, 2014. Archived from the original on September 30, 2015. Retrieved June 30, 2017.
184. "Ryanair, Boeing Finalize Max 200 Deal". Aviation International News. December 1, 2014. Archived from the original on June 17, 2015. Retrieved June 17, 2015.
185. Noëth, Bart (November 19, 2018). "Ryanair's first Boeing 737 MAX 200 aircraft has rolled out of Boeing's final assembly line". Aviation24.be. Archived from the original on August 17, 2020. Retrieved May 28, 2019.
186. "First High-Capacity Boeing 737-8 Enters Flight Test Jan 23, 2019 Guy Norris". Aviation Week Network. Archived from the original on January 26, 2019. Retrieved January 24, 2019.
187. Clark, Oliver (February 14, 2019). "Ryanair Max to make debut at Stansted". FlightGlobal. Archived from the original on November 29, 2019. Retrieved February 15, 2019.
188. Ostrower, Jon (November 26, 2019). "Boeing 737 Max re-certificaton likely to slide into 2020, Ryanair model faces new design issue". The Air Current. Archived from the original on November 29, 2019. Retrieved November 27, 2019.
189. "Every setback is an opportunity for Ryanair". The Economist. March 23, 2023.
190. Pilar Wolfsteller (April 1, 2021). "FAA certificates Boeing 737 Max 8-200 variant". Flightglobal. Archived from the original on April 1, 2021. Retrieved April 1, 2021.
191. "Boeing: Commercial". boeing.com. Archived from the original on October 2, 1999. Retrieved May 24, 2022.
192. "Boeing showing 737-8ERX concept in response to A321LR". Leeham News. March 12, 2015. Archived from the original on March 23, 2017. Retrieved March 23, 2017.
193. "Boeing's 737 MAX 9 takes off on first flight". The Seattle Times. April 13, 2017. Archived from the original on August 18, 2020. Retrieved April 13, 2017.
194. "Boeing completes 737 Max 9 maiden flight". FlightGlobal. April 13, 2017. Archived from the original on April 14, 2017. Retrieved April 14, 2017.
195. "Civil Aviation Programs To Watch". Aviation Week & Space Technology. June 9, 2017. Archived from the original on May 27, 2021. Retrieved June 13, 2017.
196. Trimble, Stephen (February 16, 2018). "Boeing 737 Max 9 receives certification". FlightGlobal. Archived from the original on May 10, 2019. Retrieved February 16, 2018.
197. "B737-9 EASA Certification Does Nothing for Values". Aircraft Value News. November 12, 2018. Archived from the original on November 13, 2018. Retrieved November 13, 2018.
198. ^ Flottau, Jens (March 10, 2017). "Customers Press Boeing To Launch New Midsize Widebody Aircraft Soon". Aviation Week & Space Technology. Archived from the original on March 10, 2017. Retrieved March 10, 2017.
199. Trimble, Stephen (July 4, 2016). "Farnborough: Proposed stretch of 737 Max 9 possible, but challenging". FlightGlobal. Archived from the original on July 5, 2016. Retrieved July 4, 2016.
200. Norris, Guy (September 30, 2016). "Simpler 737-10X, New Midsize Airplane Both 'Doable'". Aviation Week & Space Technology. Archived from the original on September 30, 2016. Retrieved September 30, 2016.
201. Norris, Guy (January 10, 2017). "Boeing Defines Final 737 MAX Stretch Offering". Aviation Week & Space Technology. Archived from the original on January 31, 2017. Retrieved January 11, 2017.
202. Ostrower, Jon (January 12, 2017). "Boeing chases airlines for stretch 737". CNN. Archived from the original on October 19, 2020. Retrieved August 3, 2020.
203. Tinseth, Randy (March 6, 2017). "MAX 10X". Boeing. Archived from the original on November 26, 2017. Retrieved March 7, 2017.
204. Johnsson, Julie (March 7, 2017). "Boeing's Longest 737 Max Can't Debut Too Soon for One Buyer". Bloomberg. Archived from the original on March 8, 2017. Retrieved March 9, 2017.
205. "Boeing Launches Larger Capacity 737 MAX 10 at 2017 Paris Air Show" (Press release). Boeing. June 19, 2017. Archived from the original on June 26, 2017. Retrieved June 19, 2017.
206. Trimble, Stephen (June 19, 2017). "Boeing launches 737 Max 10". Flightglobal. Archived from the original on May 10, 2019. Retrieved June 19, 2017.
207. Dron, Alan (June 20, 2017). "United converts 100 MAX to -10 variant; CALC includes -10s in order". Aviation Week Network. Archived from the original on June 23, 2017. Retrieved June 22, 2017.
208. "Propelled by MAX 10, Boeing thumps Airbus at Paris Air Show". Leeham. June 22, 2017. Archived from the original on January 10, 2019. Retrieved June 22, 2017.
209. "Boeing, Lion Air Group Announce Commitment for 50 737 MAX 10s" (Press release). Boeing. June 19, 2017. Archived from the original on June 30, 2017. Retrieved July 5, 2017.
210. "Boeing 737 MAX 10 Reaches Firm Configuration" (Press release). Boeing. February 6, 2018. Archived from the original on September 19, 2020. Retrieved February 11, 2018.
211. Norris, Guy (August 30, 2018). "Boeing Unveils 737-10 Extended Main Landing Gear Design Details". Aviation Week & Space Technology. Archived from the original on September 2, 2018. Retrieved August 30, 2018.
212. Norris, Guy (February 9, 2018). "Boeing Completes Configuration For Final 737 MAX Derivative". Aviation Week & Space Technology. Archived from the original on February 12, 2018. Retrieved February 11, 2018.
213. "Airport Compatibility Brochure Boeing 737 MAX 10" (PDF). Boeing. Retrieved February 12, 2019.
214. "Boeing 737 MAX 10 Makes its Debut" (Press release). Boeing. November 22, 2019. Archived from the original on September 15, 2020. Retrieved November 23, 2019.
215. Hemmerdinger, Jon (November 23, 2019). "Muted Boeing unveils 737 Max 10". Flightglobal. Archived from the original on November 25, 2019. Retrieved November 24, 2019.
216. "Why the A321XLR makes sense for Alaska Airlines". Leeham News and Analysis. February 23, 2020. Archived from the original on March 12, 2021. Retrieved February 24, 2020.
217. Jon Hemmerdinger (February 2, 2021). "Boeing delays 737 Max 10 deliveries two years, to 2023". Flightglobal. Archived from the original on February 2, 2021. Retrieved February 2, 2021.
218. Hemmerdinger, Jon (June 18, 2021). "Boeing 737 Max 10 makes maiden flight". Flight Global. Archived from the original on June 27, 2021. Retrieved June 18, 2021.
219. Dominic Gates (June 29, 2021). "United orders 200 Boeing 737 MAX planes in huge boost for the jet program". The Seattle Times. Archived from the original on July 5, 2021. Retrieved July 5, 2021.
220. Josephs, Leslie (January 23, 2024). "United CEO casts doubt on 737 Max 10 order after Boeing's recent problems". CNBC. Retrieved January 23, 2024.
221. "Ryanair Fail To Reach Agreement Over Boeing MAX10's – Travel Radar". Travel Radar – Aviation News. September 6, 2021. Archived from the original on September 14, 2021. Retrieved September 14, 2021.
222. Goodbody, Will (May 9, 2023). "Ryanair inks $40bn Boeing deal for up to 300 new 737-MAX-10 aircraft". RTE News. Retrieved May 9, 2023.
223. Guy Norris; Sean Broderick (October 25, 2023). "Boeing Closing In On 737-7, 737-10 Certification Milestones". Aviation Week.
224. "Boeing Business Jets to Offer the BBJ MAX" (Press release). Boeing. October 29, 2012. Archived from the original on November 3, 2016. Retrieved November 1, 2016.
225. "Boeing Business Jets Unveils BBJ MAX 7" (Press release). Boeing. October 31, 2016. Archived from the original on October 31, 2018. Retrieved November 1, 2016.
226. "Milestone paves the way for delivery of the newest version of the best-selling business jetliner" (Press release). Boeing. April 16, 2018. Archived from the original on October 31, 2018. Retrieved April 17, 2018.
227. "Lion Air commits to up to 380 Boeing 737s". Air Transport Intelligence News. FlightGlobal. November 17, 2011. Archived from the original on November 19, 2011. Retrieved November 18, 2011.
228. "ACG Becomes third identified 737 Max customer". November 17, 2011. Archived from the original on November 20, 2011. Retrieved November 18, 2011.
229. "737 Max commitments top 948". Air Transport Intelligence News. FlightGlobal. December 13, 2011. Archived from the original on December 30, 2013. Retrieved December 15, 2011.
230. "Ryanair places $22bn order with Boeing, buys up to 200 new aircraft". Independent.ie. September 5, 2014. Archived from the original on June 8, 2015. Retrieved April 1, 2015.
231. "Boeing, GECAS Announce Order for 75 737 MAXs" (Press release). Boeing. January 4, 2017. Archived from the original on January 5, 2017. Retrieved January 4, 2017.
232. "Lion Air Said to Plan Airbus Order Switch After Boeing 737 Crash". Bloomberg. March 12, 2019. Archived from the original on March 30, 2019. Retrieved April 30, 2019.
233. Sutherland, Brooke (March 19, 2019). "China's Boeing Threat Has More Bite Than Bark". Bloomberg News. Archived from the original on May 3, 2019. Retrieved March 5, 2020.
234. Genga, Bella; Odeh, Layan (March 13, 2019). "Boeing's 737 Max Problems Put $600 Billion in Orders at Risk". Bloomberg News. Archived from the original on March 24, 2020. Retrieved March 5, 2020.
235. Lee, Liz; Freed, Jamie (January 15, 2020). "Malaysia Airlines suspends Boeing 737 MAX deliveries due to jet's grounding". Reuters. Archived from the original on January 16, 2020. Retrieved January 18, 2020.
236. Johnsson, Julie (December 8, 2020). "Boeing Loses 23 Max Orders as Virgin Australia Remakes Fleet". Bloomberg News. Archived from the original on January 8, 2021. Retrieved January 6, 2021.
237. "Akasa Air Orders 72 Fuel-Efficient 737 MAX Airplanes to Launch Service in Fast-Growing Indian Market". Archived from the original on July 22, 2022. Retrieved June 27, 2022.
238. Chowdhury, Anirban. "Rakesh Jhunjhunwala-owned Akasa Air receives first Boeing aircraft". The Economic Times. Archived from the original on June 27, 2022. Retrieved June 27, 2022.
239. Hamilton, Scott (August 9, 2023). "Boeing reveals sub-type orders for MAX, 777X for the first time". Leeham News. Retrieved August 10, 2023.
240. Oestergaard, J. Kasper (January 15, 2019). "Airbus and Boeing Report December and Full-Year 2018 Commercial Aircraft Orders and Deliveries". Forecast International.
241. Hawkins, Andrew (January 14, 2020). "Boeing had more cancellations than orders in 2019 as 737 Max crisis deepens". The Verge.
242. Johnson, Eric (January 12, 2021). "Boeing limps into 2021 with more 737 MAX cancellations, delayed 787 deliveries". Reuters.
243. "Statistical Summary of Commercial Jet Airplane Accidents" (PDF). Boeing. September 2023. p. 10. Archived (PDF) from the original on November 1, 2014. Retrieved June 30, 2024.
244. "Lion Air: How could a brand new plane crash?". BBC News Online. October 29, 2018. Archived from the original on March 28, 2019. Retrieved March 14, 2019.
245. Kami, Indah Mutiara (October 29, 2018). "Breaking News: Basarnas Pastikan Pesawat Lion Air JT 610 Jatuh". Detik.com. Archived from the original on October 29, 2018. Retrieved October 30, 2018.
246. Levin, Alan; Suhartono, Harry (March 20, 2019). "Pilot Who Hitched a Ride Saved Lion Air 737 Day Before Deadly Crash". Bloomberg. Archived from the original on March 20, 2019. Retrieved March 20, 2019.
247. "Aircraft Accident Investigation Report. PT. Lion Airlines Boeing 737 (MAX); PK-LQP Tanjung Karawang, West Java, Republic of Indonesia 29 October 2018" (PDF). Komite Nasional Keselamatan Transportasi. Archived (PDF) from the original on October 25, 2019. Retrieved October 25, 2019.
248. "Boeing issues operational manual guidance to airlines following Lion Air crash". CNN. November 7, 2018. Archived from the original on November 7, 2018. Retrieved October 8, 2018.
249. "Ethiopian Airlines: 'No survivors' on crashed Boeing 737". BBC News Online. March 10, 2019. Archived from the original on March 10, 2019. Retrieved March 10, 2019.
250. "Official pressrelease". ethiopianairlines.com. Archived from the original on November 6, 2018. Retrieved March 10, 2019.
251. Watts, Jonathan; Burke, Jason (March 10, 2019). "Ethiopian Airlines crash: inquiry to explore how 'excellent' pilot was unable to avert disaster". The Guardian. Archived from the original on March 10, 2019. Retrieved March 10, 2019.
252. Lazo, Luz; Schemm, Paul; Aratani, Lori. "Investigators find 2nd piece of key evidence in crash of Boeing 737 Max 8 in Ethiopia". The Washington Post. Archived from the original on March 17, 2019. Retrieved March 16, 2019.
253. Asquith, James (August 19, 2019). "When Will the Boeing 737 MAX Fly Again? Not This Year". Forbes. Archived from the original on August 21, 2019. Retrieved August 21, 2019.
254. Yoon, John. "Alaska Airlines Plane Forced to Land at Oregon Airport Shortly After Takeoff", The New York Times, January 5, 2024. Retrieved January 5, 2024.
255. Petchenik, Ian (January 6, 2024). "Alaska Airlines 737-9 MAX exit door separates in flight". Flightradar24 Blog. Archived from the original on January 6, 2024. Retrieved January 6, 2024.
256. McAvoy, Audrey; Koenig, David (January 6, 2024). "Federal officials order grounding of some Boeing 737 Max 9 jetliners after plane suffers a blowout". Associated Press.
257. Hradecky, Simon (January 6, 2024). "Accident: Alaska B39M at Portland on Jan 5th 2024, emergency exit and panel separated in flight". The Aviation Herald. Archived from the original on January 6, 2024. Retrieved January 6, 2024.
258. Shepeardson, David & Insinna, Valerie. "U.S. safety board investigating Alaska Airlines Boeing 737 MAX 9 emergency landing". Reuters, January 5, 2024. Retrieved January 5, 2024.
259. "Alaska Airlines grounds Boeing 737 Max 9 planes after mid-air window blowout". theguardian.com, January 6, 2024.
260. "Federal officials order grounding of Boeing 737-9 Max jetliners after a plane suffers a blowout". Apnews.com, January 6, 2024.
261. "Boeing 737 Max 9: United Airlines finds loose bolts in jet inspections". January 8, 2024.
262. "Key bolts missing when Boeing delivered Alaska blowout jet, NTSB report says". The Seattle Times. February 6, 2024. Retrieved February 7, 2024.
263. Rose, Joel (June 13, 2024). "The FAA is investigating a new incident involving a Boeing 737 Max 8 jet in midair". NPR. Retrieved August 17, 2024.
264. "'Dutch roll' during Southwest Airlines flight causes structural damage to plane". The Times of India.
265. "737 MAX Airplane Characteristics for Airport Planning" (PDF) (Rev. H ed.). Boeing. March 2023. Retrieved February 9, 2024.
266. "Boeing 737 MAX". Boeing. Archived from the original on April 17, 2021. Retrieved July 14, 2021.
267. "Boeing 737 MAX by design". Boeing. Archived from the original on February 21, 2019. Retrieved February 21, 2019.
268. "LEAP Brochure" (PDF). CFM International. 2013. Archived from the original (PDF) on September 23, 2015.
269. "737MAX and the MD-12". Aviation Week. December 9, 2013. Archived from the original on August 19, 2016. Retrieved July 6, 2016.
270. "737 MAX". Boeing. Technical Specs. Archived from the original on November 27, 2018. Retrieved October 11, 2021.
271. "Boeing Revises "Obsolete" Performance Assumptions". FlightGlobal. August 3, 2015. Archived from the original on October 5, 2016. Retrieved May 5, 2016.
272. "DOC 8643 – Aircraft Type Designators". ICAO. Archived from the original on July 10, 2017. Retrieved July 1, 2017.

Further reading

• Robison, Peter (2021). Flying Blind: The 737 MAX Tragedy and the Fall of Boeing (Hardcover). New York: Doubleday. ISBN 978-0-385-54649-2.
• Wise, Jeff (March 11, 2019). "Where did Boeing go wrong?". Slate.
• "Countdown to Launch: The Boeing 737 MAX Timeline". Airways. January 27, 2016. Archived from the original on March 31, 2019. Retrieved January 9, 2018.

External links

• Official website
• Smith, Paul (May 12, 2017). "Flight test: Boeing's 737 Max – the same but different". FlightGlobal.
• "Boeing's Fatal Flaw (full documentary)". Frontline PBS. September 14, 2021. Retrieved September 19, 2021.

• Aircraft first flown in 2016
• Boeing 737
• Low-wing aircraft
• Twinjets
• 2010s United States airliners
• Corporate controversies
• Aircraft with retractable tricycle landing gear
• Boeing aircraft