Quote Originally Posted by BABY J
The only think the conveyor can match is the wheels spinning - which won't matter.
Of course in that scenario the plane will take off, and the ugly black square van will pull you.

But the original question does NOT have the conveyor match the speed of the wheels, but the speed of the plane/ mass, which could be interpreted that it is able to counteract any thrust/ forward motion of the plane itself by adjusting its speed accordingly.