I think that advantages and disadvantages of current and new planes should be balanced. As I notice, all planes have the same maximum speed, maneuverability, the same number of bullets and bombs.
I think, that if some plane like Rockwell has some advantage, like for example Rockwell can be hardly targeted, it should be compensated by some disadvantage, for example less bullets, lower climb rate etc.
In general, I think, there are two possibilities.
1)All planes should be the same and differ only in visual way.
2)Each plane should over perform the others in some way and be weaker in other way.
