I know this is a huge subject, and I have not read all the posts about it, but I wanted to start with a fresh point of view.
My thoughts on the mix of the plane set in Aces High (and other sims) is that to often the "Early War" planes get cast aside because they are useless against the "Late War" models.
I guess there are many ways of dealing with this; Seperate Arenas, Limit Availability, Just don't Produce certain types...etc.
My thoughts on the 3 above:
Seperate Arenas: Tend to split the community and are not as fun.
Limit Availability: I haven't seen this idea in action yet. The idea would be to limit the aircraft available in a Tour. For instance, set up Tour # 11 with just 1944 active aircraft. Then set Tour 12 to 1941...13 1942...14 1943...etc. This would give us the opportunity to enjoy the planes in a more actual setting rather than an over powering Ubbers Rule environment. I know there will be some discussion of Arenas; Pac should not battle Euro, but I think that will work out.
Just don't produce certain types: Well, I guess we all want to know what it would have been like to fly ANY WW2 plane. This one is not a good idea.
As an Ex-Air Warrior, I can tell you I left the arena many times because some rocket Jockey B&Z amazinhunk like Zazen had to interrupt a great dogfight with his Ubber Dora.
That is aggrevating to both pilots in the fight and many people hated him for it. I haven't seen such displays in AH yet, and hope I never will.
SkViper