Once the brakes are released, the wheels of an aircraft roll independently; they don’t have gearshafts and arent connected to an engine. Basically, the plane is on rollerskates at that point. As a result, even a single sufficiently strong human being could move it; see World’s Strongest Man competitions and exhibitions. Now, to move a plane at a reasonable speed so that it is clear of the terminal and able to taxi inside of a few minutes, the not so small tugs are 50 ton vehicles that are mostly engine.
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