They're doing this myth? I would've thought it would be a no-brainer...
Maybe one of their short 5 minute ones or something...
edit: wow, some people here think it might be possible? 
No forward velocity--->no lift--->no takeoff.
Now, if they were to blow a huge amount of air at a high velocity at the conveyor-belt-plane, then it would possibly work (and I can see mythbusters attempting this on a small scale, possibly)









