As Furious said. It is my understanding that display of the swastika is banned in Germany except in historical/educational settings. Use in a game is not considered to be one of those settings by the powers that be.
Since we do have some players in Germany, it could possibly present a problem for them from an legal standpoint. I'm not sure how their laws apply in cases of Internet traffic.
To illustrate the point, the international version of IL-2 Sturmovik(granted, it's a boxed sim, not purely online) defaults to the blue-dot-in-white roundel for Finns and an absence of the swastika on German planes. Those of us who aren't barred from it by law can enable the historic markings with a simple add-on utility. The Russian version defaults to the historic markings -- no such laws against its display there. (Ironic, huh?)
Anyway, I'd reluctantly weigh in with the prevailing view. Leave'em off the tails of the German planes. Keep using the proper markings for the Finnish planes -- there's already an AH precedent with the 109 G2
Splash1