WordReference Random House Unabridged Dictionary of American English © 2019
air-line  (ârlīn′),USA pronunciation adj. 
  1. straight;
    traveling a direct route:Some railroads advertise air-line routes between stations.
  • 1805–15, American.

air•line  (ârlīn′),USA pronunciation n. 
  1. Aeronautics
    • a system furnishing air transport, usually scheduled, between specified points.
    • the airplanes, airports, etc., of such a system.
    • Often,  airlines. a company that owns or operates such a system.
  2. a direct line;
  3. Mechanical Engineeringan airhose used to pipe air to a deep-sea diver, pneumatic drill, etc.

  1. of or on an airline.
  • air1 + line1 1910–15

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