air-line

[air-lahyn]
adjective
straight; direct; traveling a direct route: Some railroads advertise air-line routes between stations.

Origin:
1805–15, Americanism

Dictionary.com Unabridged

airline

[air-lahyn]
noun
1.
Aeronautics.
a.
a system furnishing air transport, usually scheduled, between specified points.
b.
the airplanes, airports, etc., of such a system.
c.
Often, airlines. a company that owns or operates such a system.
2.
a direct line; beeline.
3.
an airhose used to pipe air to a deep-sea diver, pneumatic drill, etc.
adjective
4.
of or on an airline.

Origin:
1910–15; air1 + line1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
airline (ˈɛəˌlaɪn)
 
n
1.  a.  a system or organization that provides scheduled flights for passengers or cargo
 b.  (as modifier): an airline pilot
2.  a hose or tube carrying air under pressure
3.  chiefly (US) a beeline

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

airline
1813, "beeline, straight line from place to place" (as through the air, rather than over land; in later 19c., esp. in ref. to railways that ran direct from city to city in the U.S., instead of meandering from town to town in search of stock subscriptions as early railways typically did), from
air (1) + line. Meaning "public aircraft transportation company" is from 1914.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He dithered so long over a major aircraft decision that his airline became the
  last large carrier to enter the jet age.
But don't take my word for it, and trust no airline.
Airline pilots have check flights every six months to keep them in top shape.
First on list is to fix matters with my new airline plan.
Images for airline
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