Quote Originally Posted by DaX
My whole thought process was that they would be matching the speed of the belt with that of the airplane but in the opposite direction, thus canceling out all forward motion. If that was the case you could get away with a conveyor belt as short as the airplane's wheelbase.

I'm still saying no.
A planes speed isn't measured at the wheels. Nobody cares how fast the wheels are spinning, it's the speed of the air at which the plane passes through and is measured by the ram pressure through a pitot tube.