The almighty DOS, that's right. 640K was definetely enough!Wing Commander IV
Good ol' DOS.
I had all the fancy joysticks, throtles, rudder pedals when I played it.

I was more a Privateer fan, however. I was playing that with a Thrustmaster F22 HOTAS. Every possible function programmed in...
X-COM 2:TFTD, actually. Same pricinples but with more functionality and a hell lot harder. So many nights wasted...X-COM. Hands down my favorite.
YEAH! That's my best too. I don't think I ever seen anything remotely close to this in terms of playability, content and overall fun. I still go back to it from time to time even if I almost know every step by heart.Star Control II.
Another pretty good game that I discovered along with a SNES emulator is Chrono Trigger.