With level 10 you'll finish a quest chain and "earn your wings". Despite what many people think you CAN NOT FLY EVERYWHERE in Aion. At least in the first areas there are only few places you can fly freely. Depending on the wings you have and gear stats, etc. you'll have a certain amount of flight time (rather limited). Once the timer runs out you'll get a nasty (fun!) warning *meeep meeeep* and start to fall. Yes, you can die if you fall deep enough. ouch.
This is a great preview for those of us not in beta