Airspeed refers to the speed of an aircraft in relation to the air which may be different from groundspeed which is the speed of the aircraft in relation to the ground. The difference between airspeed and groundspeed is a function of the velocity and direction of the wind. Airspeed is important because it determines the aerodynamic characteristics of the aircraft.

Airspeed Ltd was a British aircraft manufacturer, founded in 1931.

See also

• airspeed indicator