please please please STOP asking for B29 and/or nuke. In fact I need to throw myself down the stairs for bumping this thread. Actually these two wishes need to be on the banned list its not funny anymore

From the help pages:
Perk Points
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The perk system is a way for HTC to introduce some interesting but otherwise unbalancing planes on a limited basis but the benefits go deeper than that. Perk planes (and vehicles) would be things like Me 262s, Ta 152s, Tempests, B-29s, Ar 234s, Tiger IIs, etc. These are interesting rides but would be very unbalancing if they were available on an unlimited basis. So there won't be unlimited availability but they'll be available as bonuses or perks every so often.