Any plane that only served right at the very end of the war.
Any plane with really low production numbers.
Any plane with very few combat engagements
Any plane which was rushed into service before it was ready.
Any plane which will ruin arena balance.
E.g. f8f, f7f, p51Z, p47Z, spit 122, me 163,
p-80, F-14, space shuttles with death lasers
and to a lesser extent
Dora, tempest, Ta 152, me262
(p.s. last 4 do have a place but it is limited, like their use in the war, mabye in a few years)