The original tabletop air combat game as published by FASA. Not to be confused with the later iteration of the game by Wizkids which was a 'collectible' game. It also spawned a flight combat game on the PC, and later a more arcade-combat style game on the original Xbox:
Miniatures were produced by Ral Partha, and are still available from Ral Partha Europe, along with most of the expansion books. The original boxed game is quite hard to find.