Don't need full-on custom skins for each player, but I agree it would be nice to at least let the host have the option (OPTION) to set Team A "blue tails", Team B "red tails". Some visual aid like that. Going to take a while to be able to tell one plane from another just by spotting it in the action. At least with the fighters, if defending an airfield then I'm pretty sure you can pick out the bombers.
After a while, make 'em identify the plane though.