Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Air first aired on BS-i, a satellite channel of TBS, on January 62005 with the episode "Breeze", and concluded on March 312005 with the recap episode. At the end of episode thirteen of the Air anime, there was a teaser for a special addendum to the series, entitled Air in Summer. The two episodes aired on August 28 and September 4 respectively on BS-i. A DVD was later released on October 5 in Japan.
Two additional episodes of the Air anime were aired after the conclusion of the main plot. These episodes expanded on the back-story of Air, the events that were the cause for Misuzu's curse.