My First WWII air combat would have been
Lucas arts Secret weapons of the Luftwaffe
Closely followed by Chuck Yeagers Air Combat
There were other sims before that.
Janes WWII Fighters was a good blend of gameplay, eyecandy and performace. Even after I got into IL2 in a bit way, I still kept WWII fighters installed for multiplayer over a lan with my younger Nephews. Good airquake fun!