The velocity of an airplane is the rate of change of its position relative to a fixed point, such as the Earth's surface. It is a vector quantity, meaning that it has both magnitude and direction, and is expressed in units such as meters per second (m/s), kilometers per hour (km/h), or miles per hour (mph).

The velocity of an airplane can vary greatly depending on factors such as the type of aircraft, its weight, altitude, air density, and engine power. For example, a small propeller plane may have a cruising速度of around 100-150 mph (160-240 km/h), while a large commercial jet airliner may have a cruising速度of around 550-600 mph (885-965 km/h). Supersonic aircraft, such as the Concorde, could fly at speeds of over Mach 2 (1,534 mph, 2,469 km/h).

The velocity of an airplane is also affected by the direction of its flight relative to the prevailing winds. For example, an aircraft flying with the wind will experience a higher ground speed than an aircraft flying against the wind.

In addition to its cruising速度, an airplane's velocity may also include components such as climb速度, descent速度, and turning速度. These components are important for determining the overall飞行performance of the aircraft.