[KingGryphon]

I think that with planes, the battlefields would have to be huge for planes to cirle around and manuever in, which could cause lots of problems with conventional warfare.

Do the flight restrictions include maximum height levels, invisible walls and small sky boxes? or smaller things like ammunition, accesibilty, upgrades etc.?

I think that max height levels, invisible walls and small sky boxes is the biggest problems that I could see with aerial warfare. The smaller things like ammunition could easily be confined and fixed quite easily.