Ooooh! Lets see:
Janes F-15 (CLASSIC sim!)
Janes F/A-18
Janes Longbow anthology
Janes WW2 fighters
Janes IAF
Enemy Engaged Apache vs. Havoc
Enemy Engaged Comanche vs. Hokum (EE series is great! They're back compatible too, so you can fly all four Helo´s and in all 8 campaigns, which no two are ever the same.. I used to turn it on at night and just let the dynamic campaign run through the night.. So cool! Like having your own personal news channel)
DID F22
DI F18
Gunship!
Team Apache (Blah!)
Falcon 4.0
TFX
Flanker 2.0
F-19 (Remember that one?)
B-17 The mighty eighth (i.e. B17 II)
B-17 Flying fortress (i.e. B17 I)
F-117
F-15 2
Gunship 2000
A10 Tankkiller
Tried EAW, thought it was waaay to easy, even on its highest settings..
Aces over the pacific
Aces over Europe
I only liked the MS-FS series when you could still play around your own aircraft settings (ever try putting a 200hp engine and 100 foot wingspan on a cessna? Climbs like a homesick angel). Couldn´t blow anything up either, so got very boring very quickly..
Not all at the same time, mind..