Since the air is calm, the plane MUST move relative to the ground to get air flowing across it's wings.

The conveyor belt prevents it from moving in relation to the ground.

If the plane is taxiing (sp?), the conveyor belt will STILL keep it from moving.
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"Nature has constituted utility to man the standard and test of virtue. Men living in different countries, under different circumstances, different habits and regimens, may have different utilities; the same act, therefore, may be useful and consequently virtuous in one country which is injurious and vicious in another differently circumstanced" - Thomas Jefferson, moral relativist