Jesus fucking christ....

People, if there were enough FRICTION in the wheels to prevent the plane from moving, it would NEVER take off, regardless as to whether or not they're moving at 500 mph, 1,000 mph, or 0 mph for/against the airplane. The rotational speed of the tires (aka, what the ONLY motion the conveyor belt can cause) doesn't effect the speed of the aircraft anywhatsoever.

Example 1: Plane rolls down a runway, hits it's lift-speed, and takes off. Tires stop rolling, eventually, due to the minor friction they have in their bearings. So at some point, the tires aren't moving at all. To rephrase: Rotation of tires = ZERO mph. However, the plane is still moving, aka, FLYING. Rotational speed of the tires does NOT equal (or even effect, for that matter) the speed of the aircraft.

Example 2: Plane is coming in for landing. Hasn't touched down, yet. Tires are rotating at 0 miles per hour. Plane is still moving forward.

The only way the aircraft can NOT take off, is if the ROTATIONAL speed of the tires can somehow effect the DIRECTIONAL speed of the aircraft. Unfortunately, this is NOT the case. The tires rotate INDEPENDENTLY of the aircraft's forward movement, because the tires are NOT the propulsionary mechanisms in an airplane!!!

Once again, forward thrust of a plane is NOT caused by torquing the tires. EVER. It is not a car. Therefore, a conveyor belt torquing the tires (causing a rotational movement) in either direction does NOT effect the forward thrust caused by the plane's engines. The tires/wheels are just along for the ride.

For those that like math... If the conveyor belt moves 300 mph in the opposite direction the plane is wanting to go, then the tires of the plane are actually going in FORWARD rotation (it's like gears; one spins one way, other spins OPPOSITE way) at 300 mph. As the plane begins to take off, the tires (because they're just free-spinning, anyways) will start to accelerate. By the time the plane hits 200 mph & takes off, the tires are spinning at 500 mph, but moving forward at only 200 mph.

Those that think the plane can't take off: quit mistaking ROTATIONAL speed of the tires with DIRECTIONAL speed of the aircraft. They're COMPLETELY different things.

The plane fucking takes off.