[Radoye]

If you want to add historical nations though, how markings for nations which actually had air forces - like the Austro-Hungarian Empire, Imperial Germany and the Ottoman Empire?

A-H and Germany would have exactly same markings - first the Iron Cross later switch to Balkenkreutz. WWI Bulgaria too.

Ottoman Turkey had the same markings as the later Turkey. Early on the markings used to be either black or red squares, later they settled on red.