An important aerodynamic force during low-speed subsonic flight is the shear force (the sideways force or internal friction) caused by viscous airflow over the surfaces of the vehicle.
These were used on subsonic flights between Dallas-Fort Worth and Washington Dulles International Airport, flown by Braniff flight crews, Air France and British Airways crews then taking over for the continuing supersonic flights to London and Paris.
 See also: Dynamic, Direct, Cross, Wheel, Airframe
  
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