Falcon 4.0 and it's other mods (SP4, FF3,BMS2), including the latest Falcon 4 Allied Forces.
Microprose Gunship! (that's the second title not the original older one)
I do have a lot of the other Jane's series of combat sims (Longbow,USAF, F-15, FA-!8), but don't have them installed now. Since I don't have that much hard drive space and only confine the space now to those I use the most.
So currently if I want to go shooting stuff down. I pick one of the Falcon versions or fly in a helicopter in Gunship!:)