All it would be is a great way to get your aircrew killed. There is a reason aircrew take shelter when the field is under attack rather than run to their aircraft's turrets.
Really? Do any of you guys ever step back and assess the ramifications of your statements when taken into account with everything else in the game?
You are artificially preventing something that was possible, because it's not realistic... applied across the board, you'd have a 4.5GB patch coming to address all of the non-historical, unrealistic uses of vehicles in the game.
Just call it what it is, an artificial limitation for the sake of gameplay and stop trying to put lipstick on a pig.