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ALPA: Air Line Pilot Association

ATC: Air Traffic Control

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CAT I: Facility providing operation down to 200 feet decision height and runway visual range not less than 2600 feet

CAT II: Facility providing operation down to 100 feet decision height and runway visual range not less than 1200 feet.

CAT II a: Facility providing operation with no decision height limit to and along the surface of the runway with external visual reference during final phase of landing and with a runway visual range not less than 700 feet.

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CAA: Civil Aviation Authority

CASM: Cost per Available Seat Mile -- the cost to fly one seat a distance of one mile. Also CASK, using kilometers instead of miles.

CDR: Coded Departure Routes. Predefined routes used to route air traffic around areas of severe weather.

Ceiling: The height above the ground of the base of the lowest layer of clouds when over half of the sky is obscured.

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EQP: Equipment -- the aircraft type/make/model utilized for a particular operation.

ETA: Expected Time of Arrival

ETOPS: ETOPS (Extended-range Twin-engine Operational Performance Standards) is an acronym for an International Civil Aviation Organization (ICAO) rule permitting twin-engined commercial air transports to fly routes that, at some points, are further than a distance of 60 minutes flying time from an emergency or diversion airport.


FFP: Frequent Flyer Program

FOD: Foreign Object Damage

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HGW: Higher Gross Weight -- usually used in conjunction with Airbus aircraft to signify one capable of operating at a higher MTOW than its predecesor.

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IATA: International Air Transport Association

ICAO: International Civil Aeronautics Organization

IGW: Increased Gross Weight -- usually used in conjunction with Boeing aircraft to signify one capable of operating at a higher MTOW than its predecesor.

ILS: Instrument Landing System -- a ground based precision approach system that provides course and vertical guidance to landing aircraft.

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Jungle Jet: EMBRAER Regional Jet

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MTOW: Maximum TakeOff Weight

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Nautical Mile: Unit equal to 6,076.115 feet (1,852 meters)

NAVAID: Navigational Aid -- a visual or electronic device, airborne or on the surface, which provides point-to-point guidance information or position data to aircraft in flight.

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QuadJet: Air transport which utilizes four engines

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RASM: Revenue per Available Seat Mile. -- the gross revenue earned from flying one seat a distance of one mile. Also RASK, using kilometers instead of miles.

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Tundra Jet: Canadair Regional Jet

TwinJet: Air transport which utilizes two engines


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V1: Velocity of decision -- the point at which an aircraft must continue its takeoff roll.

V2: Takeoff Climb Velocity

VR: Velocity of rotation -- the point at which the aircraft nosegear leaves the ground during its takeoff roll.

VFR: Visual Flight Rules -- rules that govern the procedures for conducting flight under visual conditions. The term "VFR" is also used in the United States to indicate weather conditions that are equal to or greater than minimum VFR requirements. In addition, it is used by pilots and controllers to indicate type of flight plan.

VOR: Very High Frequency Omni Directional Range -- a ground-based electronic navigation aid transmitting very high frequency navigation signals, 360 degrees in azimuth, oriented from magnetic north. Used as the basis for navigation in the National Airspace System. The VOR periodically identifies itself by Morse Code and may have an additional voice identification feature. Voice features may be used by ATC or FSS for transmitting instructions/information to pilots.

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