Mythbusters are doing that one in Episode 97 30th January.

First up, for those concerned that this story has been cancelled, don't worry, planes on a conveyer (sic) belt has been filmed, is spectacular, and will be part of what us Mythbusters refer to as 'episode 97'. Currently that is due to air on January 30th.
Apparently there was a mix up and a lot of angry nerds burnt the internets down cos they didn't see it on the advertised show.