Seriously. How do they fly? It's not because Krypton had more gravity. That doesn't make a lick of sense. I've heard the telekinetic theory, and it seems to fit best. You know, how Kryptonians develop minimal telekinetic powers that enables them to fly and lift objects without breaking them (for example,Supes could lift a plane from the wing, even though in real life, the wing would snap off.)