Some units can attack flying targets so how about a flying defense

I was thinking about maybe having a flying defense like a Flying Fortress which is a flying castle with a troop or something on it to attack and only units such as archers, wizards, dragons, Ect. Can attack it I just thought of this so i still don't know what it coul be but supercell should incorporate this defense into the game. Please help me come up with new ideas for this flying defense.

Health: 600
Damage: 20
Range: 15 tiles

No. Some armies have very few troops that attack air and it's unfair to take them out of the game completely just because of a tower. This would mean that hog, Pekka, and Valk heavy armies are unusable.