I actually downloaded this game because I thought that it might be a freely roaming helicopter game like Desert Strike, but it wasn't - but that's OK cos it was still good. It's basically a vertically scrolling helicopter-based shoot 'em up, but the angle is shifted so that you are half flying into the screen, and all the graphics are proper 3D.
There are actually 3 Airstrike games: Airstrike3D, Airstrike II, and Airstrike II: Gulf Thunder.
Airstrike II, by Divo Games is a downloadable 3D action game for PCs.