WWII is great, but so would a Vietnam era game be. Jets, but still a lot of reliance on guns and poor performing missiles.

I'd love an F-4 with missiles making pretty trails through the air in random directions. LOL Include various choppers...oh yeah.
Bring it from Vietnam through the 80's. Give me an A-10 and an F-15 and I'll be happy for years. Perfect companion to IL2, I wouldn't need any PC games then.