Heroes in the skies..
http://his.gamescampus.com/index.asp
Pretty decent game really if you ask me, just give it an hour or so to get into it :P
EDIT: Also Battleground europe (as the post above said) is a really nice game, I think that you won't be able to play as the pilot class after the 14 free days though, since the free players are restricted to the infantry class only (I think, not completely sure so you might wanna check that up)





You can't even do barrels or similar evasion moves. Not worthy of attention :|