People no longer need the wheel in the jet age. 
Now skis have come back; skis, skids and boats. 
And wings themselves are really a form of skiing in 
the water or the air. But the wheel retracts into 
the airplane in flight. Beyond a certain speed the 
wheel is useless.

Harry Boyle, “McLuhan: Has Business Got The 
Message,” Stimulus , May-June 1967.