Quote Originally Posted by Para
I understand that the wheels do not propel the plane.

The OP posted stated that the conveyor belt moves in the opposite direction at the same speed as the plane.

The plane will never have forward motion if the conveyor belt continues to move at the same speed as the plane in the opposite direction.
Doesn't matter if the conveyor belt is still or moving forward or backwards at 5 mph or 500 mph.

Imagine a skate board on a treadmill, you can prevent it from moving backwards with just a finger right? Speed up the treadmill and it wouldn't take any more effort of that one finger to hold it in place right? No matter how fast that threadmill is moving couldn't you still push the skateboard of the front of the treadmill?