(aviation) A predefined route, or series of routes, in which a commercial or military aircraft must fly.

An inlet for air; the part of an engine, especially a jet engine, through which air is drawn.

A chamber, in a hydraulic system, in which air (or some other gas) is compressed to regulate the flow of a fluid.

A layer of trapped air that supports a hovercraft. / A shock absorber that uses an air chamber. / A rubber or plastic inflatable cushion.

A hole in any surface that allows air or other gases to pass, especially an opening in the surface of a frozen lake etc. / An air pocket. / The blowhole of a whale.

(military) A military airport, providing housing and support for aircraft and personnel.

(military) The act of using aircraft to attack an enemy to assist ground military forces.

The middle of the air, as while in flight.

To assuage a hostile situation.

Alternative spelling of airbag.