[Ian]

does the belt act directly on the body of the plane? no. does the belt act drectly on the wheels? yes. do the wheels act directly on the body of the plane? NO. Does the body of the plane act directly on the wheels? yes.

the thrust is coming from the body of the plane. the wheels begin to roll, and the belt starts to roll the opposite direction. If the wheels were driving the plane (like a car) that would be direct opposition to thrust. the only way to directly oppose the thrust of the plane would be to put the nose of it up against a wall or find some other way to restrain it.