air mile
Noun: 1. A unit of length used in navigation: An "air mile" is a unit of distance equal to exactly 1,852 meters. It is historically based on the distance spanned by one minute of arc in latitude. 2. A nautical mile: "Air mile" is a synonym for a nautical mile, especially in the context of aviation and maritime navigation.
The term "air mile" is used to measure distances over water or in the air. It is the standard unit in international maritime and aviation law and for global navigation.
- The flight from London to New York covers approximately 3,000 air miles.
- The ship had traveled over 100 air miles from the coast.
- Pilots calculate fuel requirements based on the number of air miles for the journey.
- In navigation systems: The "air mile" is the fundamental unit used in GPS and chart plotting.
- The waypoints on the aeronautical chart are spaced five air miles apart.
- Nautical mile (n): The more common technical term, identical in length to an air mile.
- Knot (n): A unit of speed equal to one nautical mile per hour.
- The aircraft's speed was 450 knots.
- Nautical mile
- Sea mile
While "air mile" is a correct term, in precise technical contexts (e.g., aviation manuals, maritime charts), the term nautical mile is more universally standard. In commercial contexts, "air mile" can also refer to frequent flyer reward points, but that is a separate, unrelated meaning.
- a unit of length used in navigation; exactly 1,852 meters; historically based on the distance spanned by one minute of arc in latitude