Way too many planes not modeled that did participate in the conflict to do before considering those who coulda shoulda woulda in my opinion.
P39s, lighweight P40Ns, maybe the Merlin P40Fs and Ls that saw action with those MTO USAAF P40 groups. What about B25s and A26s. Allison engined Mustangs for the MTO, RAF in the ETO and CBI fans.
All kinds of Spit variants. You want a 4 cannon Spit, then get the Spit 21. It got into action before the war was over. I'm kinda partial to the Spit XII for the low alt work. They certainly saw combat. Might want to get the Meteor in the game as the Allied jet and see how it matches up to the 262.
Might as well get the Beaufighter, Whirlwind, Me210/410, He219 etc in. Lots of German bombers, Italian stuff, Russian stuff, Japanese stuff that saw combat that would add to the fun, before those that didn't quite make it.
I'm sure folks can name a lot more.
Dan