This was really good! I didn't like the sudden black frames at the start when moving from one shot to the next, it was jarring. Everything else was awesome, and I just spent some money because of this on some new-to-me music via Amazon. Loved the music.
Pacing-wise, I wish you got to the action sooner. I'm thinking of making an "Aces High Tropes" page, and number one on the list of tropes will be "spend half the film building up to something, then find out it was 15 seconds of dropping bombs, then spend the rest of the film dramatically landing." At least you had some action after the bombs were out, but it seemed to have little to do with the bombers. I guess its up to the viewer to guess that the German aircraft were upping to intercept the bombers, and instead got intercepted by American fighters.
Audio-video sync was awesome by the way. That was really the best part IMO.