Now I know dirt airfields have 3 slots and can't host strat or jet bombers, normal airfields have 7 slots and can host every airplane.
For some reason I now have a normal airfield that apparently only has 5 slots?

As you can see I am trying to rebase, but there seems to be no slot in that airfield. I can rebase to the dirt airfield to the right. I know planes have a limited range for rebasing (how high is it anyway?), but I rebased the same airplane already the that airbase from the exact same airbase, so range can't be the issue.