that is an AWESOME idea!!!! Im all for it!!!!!
I'd add:
Map 1 to have Map2 and Map3 planes as mid-cost perks (10-20 perk cost) and map4 planes at high cost (40 perks)
When in map 2, the Map1 planes gain 2X the perks per kill, map2 planes unperked, map3 planes mid-cost and map4 high cost.
When in map3, map1 planes gain 4X perks, map2 planes gain 2X perks, map 3 unperked, map4 planes are low cost perks.
And so on for map 4.
And of course, we would need to have early war planes in the game.. Brewster Buffalo, P-40, Hurricane,P-38F & J , French planes, Dutch planes and some more italian planes (Fiat Biplane! whoohoo!)
