Dont think it is necessary, but having hidden airfields in the MA would be a nice addition and would add more strategy to the game.
These airfields would be invisible on the map and would only be localized deep in the heartland of the country. The airfields have a limited planeset and are very hard to see from a plane. They can not be captured but can be destroyed completely. Once they are destroyed, they stay that way until reset.
These fields would be localized around important airfields, far away enough to be out of sight, but close enough to quickly get there by plane. Maybe even requiring the player to pay a certain amount of perks to be able to use that field. The players have a chance of defending thier airfield without getting vulched at the expense of some perks.