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air-line

[air-lahyn] /ˈɛərˌlaɪn/
adjective
1.
straight; direct; traveling a direct route:
Some railroads advertise air-line routes between stations.
Origin
1805-1815
1805-15, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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