The mythbusters experiment doesn’t really match the true “spirit” of the plane on a conveyer question though as the conveyer is undergoing travel in a direction (rather than being stationary but rotating)
Air movement in and around the wings generates lift, so if the plane is moving, because the conveyer is, as in the mythbusters experiment, if you’re lucky, at some point, lift is greater than gravity, and the plane will take off.
The proper test should be when the plane is on a stationary but still rotating conveyer… 😉