No unarmed or non-combat skins are allowed. The c-47 is out because it has pre-war markings and was only used state-side.
The F4u "Sally" should never have been included in this game. It has no guns. It was unarmed and did not see combat. Further, in-game it's garrishly pure white (blech) whereas it's supposed to be aluminum. The black version, if it's the same plane repainted (I'm unclear about that just reading the captions by the photos) should not be allowed for the same reasons (non-combat, unarmed plane). However if the black one was armed and did fly that way, then there's no reason it shouldn't be included.