Plane on a treadmill .. to be on Mythbusters

[drkohler]

z64dan said:
"If a plane is traveling at takeoff speed on a conveyor belt, and the belt is matching that speed in the opposite direction"

this whole concept is a little iffy. Is it traveling at takeoff speed relative to the conveyor belt, or the air?

It simply means that the plane is at the same place at all times, no matter how fast the belt turns. If you stood at the belt, you could enter and leave the plane at any time without moving to the left or right (though I'd not recommend it).