Final answer:
Ailerons may have differential control.
Step-by-step explanation:
In the context of aerodynamics and aviation, the primary control surface that may have "differential" control is the aileron. Ailerons are typically found on the wings of an aircraft and are used to control the roll or banking motion of the aircraft. When differential control is applied to the ailerons, it means that the upward deflection of one aileron is greater than the downward deflection of the other aileron, resulting in the aircraft rolling or banking in the desired direction.