How does criss angel levitate?

youtube has a video that gives away his trick to the steamroller act and how he levitates with an object like a chair or box in front of him...but how is he actually floating in air above the luxor hotel and across high rise buildings? earlier i posted a similar question about criss angel, but people just say its real and they've seen him live. i KNOW its NOT real, but does anyone out there, once again, know the trick? its bugging me so bad...theres gotta be some magician out there that knows??? come on...tell me please!