Off the beaten path, and not WW2, those are my favorites.
What's the movie with Robert Redford, where he fights in WW1, then he becomes a stunt pilot and during a movie shoot he fights the WW1 german guy that shot his newbie war wingman?
I was always a fan of
The Flight of the Intruder, as the Mig is a Mig, the ZSU 23-4 is a ZSU 23-4, the Sandy is a Skyraider ...
Bat 21, an another great war aviation movie.
L'instinct de L'ange, if I recall the title correctly, it's a French movie about a rich kid that signs up for WW1 to be a pilot. He really sucks but his money keeps him in a squad. One day, there's a fight and he runs away. When he lands everybody things he's an ace because he survived. To live up to his reputation, he start to be fearless and actually becomes a real ace... till the day he let his vanity prevail above comon sense and gets shot down.