So we have:
1) He's superman, he can do whatever the hell he wants!
2) Mad flying skills.
3) The atmosphere on Earth is thicker, so he floats on atoms. (Wow!)
4) Something about technorealism control of own gravity field, etc... (Huh?)
5) He's been doing it for years.
6) He flaps his arms very fast!
7) Because he's an alien.
8) The upward force generated by his flight power is matched to the downward pull of gravity, thereby keeping him still in midair.
9) Powerful farts
10) Something about displacement of energy, like water displacement. (Hmmm)
11) A lack of red underwear on the suit.
After all that... I guess post #20 will have to suffice. Thanks, tripoli!