It's manageable with bombers because bombers get a lot of direct xp from killing tanks rather than fighters which rely on a large proportion of their prem xp coming from a doubled mission reward bonus.
Basically it just gives an extra bonus to the crew skills.
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I realise that it may be a lot of work to add new skins, especially for smaller air forces, but it would be very exciting to see.
There are already a few aircraft that have skins representing air forces of a different nation than the plane itself.