@keatsv Actually, from my understanding the airfield needs to be in your control and the state needs to be in your control. Capturing the enemy airfield denies them the use of it, but you can't actually use it until you control the majority of the state. This way we can deny the enemy use of an unguarded airfield with paratroopers or a spearhead (of we know where they are, which is hard now but which ought show if you have aircraft in the zone).
Which is also a bit odd, but I guess it would be even more odd if I could base planes in an enemy province just because I control the state.
Big problem really is all the huge states, or rather, the size difference of states, since we can't chose which province the airfield is in, if it were centered on the field the range could get loop sided if the airfield was in an edge province. If the airfield was always in the center we would have a lot of mountain airfields(much to easily defended). Making the provincial would increase micromanagement a lot. Although with the new air system it would be a lot easier than before, but the airfields would need smaller capacity and thus making us have to use small wingsizes.
The current solution might not be the most elegant, but its probably the best from a gameplay perspective.