What unit is typically used by the airspeed indicator to display speed?

• A. Knots.
• B. Miles per hour.
• C. Kilometers per hour.
• D. Meters per second.

Answer: (A)

The key idea is that airspeed indicators use knots as their standard unit. Knots—nautical miles per hour—are the aviation standard because they align with navigation, flight planning, and ATC practices that span oceans and continents. Using knots makes it easy to compare speed through the air with charts, airways, and wind corrections, regardless of where you fly.

Other units like miles per hour, kilometers per hour, or meters per second aren’t the conventional cockpit display for airspeed. They may be seen in ground-speed references or other contexts, but the instrument in most aircraft is calibrated to show speed in knots, and that’s what pilots rely on for safe, consistent operation.