A region's air supply. / The region supplied by a source of air.

Alternative form of airshaft

(of a missile) fired from the ground at an aircraft in flight, or at an incoming missile

(of a missile) fired from the ground, or from a ship, at an aircraft in flight, or at an incoming missile

the facility on an airfield or airport where aircraft are loaded and unloaded of passengers or freight

(of a missile) fired from an aircraft at a target on the ground

(of a missile) fired from an aircraft at a target on land or water

the science and technology of determining the position of an aircraft with respect to the surface of the earth and accurately maintaining a desired course

A designated route used by commercial aircraft when flying from one airport to another.

An aerogram; a letter sent by airmail.