Which instrument displays airspeed?

The airspeed indicator is the instrument designed specifically to display airspeed. It measures the difference between the dynamic pressure of the air flowing over the aircraft and the static pressure of the surrounding atmosphere. This dynamic pressure is then converted into a reading of the aircraft's speed relative to the air around it.

Understanding airspeed is vital for safe flight operations, as it informs the pilot about the aircraft's performance, including its ability to climb, descend, and maintain level flight. The airspeed indicator is calibrated in knots and typically displays various speed ranges important for takeoff, landing, and maneuvering.

In contrast, the altimeter measures altitude above sea level by assessing changes in atmospheric pressure, the vertical speed indicator tracks the rate of climb or descent, and the attitude indicator shows the aircraft's orientation relative to the horizon. None of these instruments provide information about airspeed, which is why the airspeed indicator is the focused choice for this question.