YES! I rember when in MW eny was 45. Killing P-38s was real fun in M-3s.
im still a big advocate of ENY not ELIMINATING aircraft, just adding a perk value to previously free ones..
I.E. if you want to fly a 5 ENY plane, and ENY is at 5, it costs you 1 perkies, if its at 6, it costs you 2.. etc and so on and so forth..
that way there is still a limiting factor, if you want to fly a low ENY plane at all times, its gonna cost ya, but at the same time, you can always fly whatever ya want. ( just better make sure you can afford losing it)