Im with munck.
However there are a few tweeks I have considered for a new interceptor. Not tested yet.
The 1 round fighter air superiority is excellent. We tried it for more rounds once and only once, it was very expensive. And every one only bought fighters. If you change that you need to make air cheaper to buy. Possibly lower attack/defense value also. Or there will be fighters on CAP every where, making them cheaper or same cost as destroyers with more movement. This would eliminate most naval builds in our group by Cost vs ability. We consider this a game breaking change and decided to never try it again! All units would need a cost change resulting in an entirely different game.
Also like the 1 round interception combat, it simulates the difficulty of intercepting a planed hit and run bombing raid.
Currently the cost and values of all aircraft work very well. If you change one thing other things are affected in a chain reaction to maintain balance of purchase and prevent Over-Powered units.
If I was to required to change something, I may try to incorporate a new unit like fighter-interceptor as example. That is designed only to attack air units and try that out. Giving it a token A/D @1 versus ground or naval and increase its interception value to 5.
A6(5)/D6(5)/M4/C10 ground/naval attacks @1. Just a specialized interceptor, similar to AA but limited enough not to replace existing units.
Or simply do as tac bomber already is and give fighters target select @ 1-3 on air units and eliminate the air superiority round completely. This one appeals to me most with its simplicity.