- straight; direct; traveling a direct route: Some railroads advertise air-line routes between stations.
Origin of air-line
An Americanism dating back to 1805–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for air-line
Tupelo is about forty miles south of Rienzi, on an air-line.The Iron Furnace
John H. Aughey
It is seventy miles in an air-line from Stony Crossing to the fort.Raw Gold
Bertrand W. Sinclair
Like his companion, this insect rose and encircled the stump several times, ere it darted away toward its hive, in an air-line.
The animal flew in an air-line toward a point of wood distant fully half a mile, and on the margin of the prairie.
Although he moved swiftly, and nearly by an air-line, his thoughts scarce kept company with his feet.