@jacobg I think that makes airplanes too vulnerable. You would need to make them cheaper.
Cheaper airplanes and more effective AA might well be more realistic, but be careful about shifting the balance.
If Germany attacks over the Maginot Line and in a few turns France takes it back, do all the benefits of the Maginot Line go back in effect or is it considered destroyed after the first attack?
@timothy-gengarella all the forts and coastal guns in the zone are lost if you lose the territory