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Hover In Ground Effect. Hovering within one rotor diameter of the ground in order where performance is increased by the interaction of the helicopters rotor downwash and the ground.

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An instrument on the ground to allow an instrumental landing.

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Flight level is the nominal altitude of an aircraft referenced to a standard pressure datum, as opposed to the real altitude above mean sea level.

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A building at an airport where the air traffic control monitors the movement of aircraft.

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The load factor necessary for an airline to break even. It is a function of the percent of seats filled at a particular yield versus the airlines operating costs

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Pilot or crew member of an aircraft.

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A rotor-craft with unpowered blades that develop lift, and an engine-powered propeller to provide thrust.

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The orientation of an aircraft with respect to the horizon.

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The paved area at an airport.

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A set of steps used by passengers and crew to embark and disembark from a commercial aircraft.

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A lighter-than-air craft that can be steered and propelled through the air.

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An area designated for the takeoff and landing of aircraft.

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A powered aircraft that derives its lift from the movement of air over fixed lifting surfaces.

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A vehicle that can travel through the air.

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On an aircraft, the ailerons are a control surface usually on the trailing edge of the wings. The ailerons are used to control roll by generating asymmetric wing lift. The ailerons are on the outside of the wings and operate oppositely

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A lighter-than-air craft, such as a balloon or airship. Its lift is caused by buoyancy relative to the surrounding air.

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A power-driven heavier-than-air craft that derives support in the atmosphere from the reactions of the air on its surfaces that remain fixed under given conditions of flight.

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Pilot or crew of lighter-than-air craft.

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A heavier-than-air craft, deriving its lift from motion.

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An airfield used for managed aircraft operation. In Britain, an alternative term for airport.