Air mile and Nautical linear unit

Air mile noun - A unit of length used in navigation; exactly 1,852 meters; historically based on the distance spanned by one minute of arc in latitude.

Nautical linear unit and air mile are semantically related. In some cases you can use "Nautical linear unit" instead a noun phrase "Air mile".

Nautical linear unit noun - A linear unit of distance used in navigation.

Air mile and nautical linear unit are semantically related. Sometimes you can replace phrase "Air mile" with "Nautical linear unit", this phrases are similar.