A duct, through which air is forced or extracted, that forms part of a building's air conditioning and ventilation system.

Alternative spelling of airflow

(UK, aviation) A female flight attendant; a stewardess.

Any device that filters or otherwise cleans air; an air purifier.

The payload of an aircraft (not counting passengers). / Cargo (freight) that is carried by air.

(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.

Any flow of air, especially the motion of air around a moving aircraft or aerofoil.

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