What term describes the speed of an aircraft relative to the surrounding air mass?

• A. Airspeed
• B. Ground Speed
• C. Velocity
• D. Drag

Answer: (A)

Airspeed is the speed of an aircraft relative to the surrounding air mass. This measures how fast the airplane is moving through the air itself, independent of how the ground might be moving beneath it. Wind can distort ground speed—tailwinds raise ground speed, headwinds lower it—while airspeed stays the same because it’s tied to the air the aircraft is flying through, not the ground.

Velocity combines speed with direction, which isn’t what this term specifies. Drag is a resistive force, not a speed measure. Ground speed is the speed relative to the ground, which is different from airspeed. In aviation you’ll also hear indicated airspeed, true airspeed, and calibrated airspeed, but all describe how fast the airplane moves through the air rather than over the ground.