Without a doubt get LOMAC-Lock On Modern Air Combat.
Some might prefer the Dynamic campaign of Flacon 4 but LOMAC is a much better game in the end.

Its a bit unorthodox but , if you want you can read my tutorial, with ingame Screen shots, about 1 aspect of air combat in the game, it might give you some insight to the game as well as introduce you to how the game looks like.

The First part of the tutorial
http://www.twcenter.net/forums/showp...&postcount=136

and the 2nd Part
http://www.twcenter.net/forums/showp...&postcount=137