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ABSOLUTE ALTITUDE
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The measureable height of an aircraft above the actual terrain.
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ABSOLUTE CEILING
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The maximum altitude above sea level at which an aircraft can maintain level flight under Standard Air conditions.
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AIR TAXI
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An aircraft operator who conducts operations for hire or compensation. An air taxi operates on an on demand basis and does not meet the "flight scheduled" qualifications of a commuter.
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AIR TRAFFIC CONTROL (ATC)
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A service operated by the appropriate authority to promote the safe, orderly, and expeditious flow of air traffic.
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AOA
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Airport Operators' Association.
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AOG
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Aircraft on ground, a term used to denote urgency when requesting spares or service from suppliers or manufacturers, meaning that the aircraft cannot fly again until the parts have been supplied.
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AOPA
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Aircraft Owners and Pilots Association.
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APA
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Aerodromes Protection Agency, the federation of associations for the advancement of British general aviation facilities.
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