Altitude is the height of an aircraft above mean sea level, usually expressed in which unit?

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Multiple Choice

Altitude is the height of an aircraft above mean sea level, usually expressed in which unit?

Explanation:
Altitude above mean sea level is measured in feet. In aviation, feet are the standard unit used for AMSL because charts, ATC instructions, and flight planning all rely on a consistent feet-based reference. The altimeter is set to the local pressure so its reading corresponds to height above sea level, not above the terrain. While meters appear in some contexts or regions, the prevailing convention for AMSL altitude remains feet. This consistency is essential for safe vertical separation and clear communication, especially when comparing altitudes across different flights and airspace.

Altitude above mean sea level is measured in feet. In aviation, feet are the standard unit used for AMSL because charts, ATC instructions, and flight planning all rely on a consistent feet-based reference. The altimeter is set to the local pressure so its reading corresponds to height above sea level, not above the terrain. While meters appear in some contexts or regions, the prevailing convention for AMSL altitude remains feet. This consistency is essential for safe vertical separation and clear communication, especially when comparing altitudes across different flights and airspace.

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