Those that need them will fly them.
As will those that want them. But, somehow, punishing the vets is needed to 'save the game' (promote variety). If someone wants to suggest a method to promote variety then ask Dale if there can be a specific 'plane of the day' that will earn more perks just for selecting it.
"Ladies and gents, today's planes of the day are the P-40 E and C.202. Both of these planes are 'early war' planes. All kills will earn double perk points (experienced pilots would be able to take advantage of this without it causing a game collapse) and every 5 minutes in the air in one will earn 2 perk points (so even the new players benefit). If the plane is eligible to earn perks in attack mode (the C.202 cannot) then points earned destroying objects is doubled (but the flight time perk points will still be fighter perks)."
Alternatively, mid-war planes used as planes of the day could earn bonus perks at 1.5 the normal rate and 1 perk per 5 minutes of flight.
That might mix up things a bit without punishing veteran players.
The ratio I suggested is on the fly and might could use tweaking.