Agree on 633 sqn (just watched it) plus Coates' Dambusters and the march. For my money, though, Ron Goodwin excelled 633 with his rushed score for the Battle of Britain. This was commissioned after Sir William Walton delivered a score which producers/director deemed too short.
Walton's "Battle in the Air" movement is only bit of his score which survives in the film (plus final triumphal march in some prints) and "Battle..." is the definitive piece of aviation music for me. The rest of the score, if you can get hold on it, is also pretty powerful. Would love to have seen some of the dogfight scenes done to Walton's ballet/dance music.
For a piece of music completely in tune with the essence of flight, may I recommend Gerry Goldsmith's title theme for TV's Star Trek Voyager. Forget any prejudices about Trekkie anoraks et al. Just watch the titles and feel the ship move to the music. (7 of 9 has nothing to do with this and I always turn off when titles finish - honest!)