What about IL-2 Sturmovik? It is possibly the most critically acclaimed flight sim of all time, and it is by far the best WWII flight sim ever released. From what I've read, the multiplayer is excellent, so it sounds like a great game for AK play. I'm thinking about buying it ASAP. Anyone else interested?
Check out these reviews:
http://gamespot.com/gamespot/stories...829773,00.html
http://www.wargamer.com/reviews/il2_sturmovik_main.asp
http://www.gamespy.com/reviews/december01/il2/