Does "perk" mean a plane is only used by a limited number of ppl??
I think if yes, the D9 should be open to every player, its no the prob of the D9 pilots that Stang or Spit jockeys would be feared by its climbrate and turnrate. It simply a fact of WW2, and another interesting point is that the D9 could also be equiped with GM-1 to boost high alt performance, and u could use MW50 and GM-1 in the same plane, which gives u 3 forms of WEP, the normal pulling through the gate, MW50 below 6km and GM-1 above 6km.
It was widely used by JG26 and JG54, so it should be public.
Only to say it, the idea of limiting a plane to players that score a special amount of points, only favours the vulcher culture. A plane should be in the game or not in the game but not only available to a so called "Elite of AH pilots".