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(Aeronautics) an air route along which aircraft are allowed to fly
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
cor•ri•dor(ˈkɔr ɪ dər, -ˌdɔr, ˈkɒr-)
1. a passageway giving access to rooms, apartments, ship cabins, railway compartments, etc.; hallway.
2. a narrow passageway of land, as between an inland country and an outlet to the sea.
3. a densely populated region with major overland and air transportation routes: the Northeast corridor.
4. a restricted path along which an aircraft must travel to avoid hostile action, other air traffic, etc.
[1585–95; < Middle French < Upper Italian corridore=corr(ere) to run (< Latin currere]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
A restricted air route of travel specified for use by friendly aircraft and established for the purpose of preventing friendly aircraft from being fired on by friendly forces.
Dictionary of Military and Associated Terms. US Department of Defense 2005.