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The Flight4 Air Aviation Jargon list provides explanations to some of the less obvious terms used by the airline industry in relation to general aviation, flight reservations and ticketing.

ABC - (Advance booking charter) A charter flight that requires a minimum
advance booking period.

ABP - (Able-bodied passenger).

Accompanied baggage - Baggage carried onboard by the passenger.

ACFT/EQT - (Aircraft type).

Administrating Carrier - The airline controlling the operation of a flight.

Air Passenger Duty - A charge payable on tickets for flights departing
the UK.

Aircraft Configuration - Layout of aircraft interior space and seating.

Airport Code - A unique tree-letter code used by the aviation industry and given to every airport in the world.

Airside - The area of airport beyond the passport and security
check areas.

Alliances - The International strategic groupings of airlines.
Currently: StarAlliance, Oneworld and Skyteam.

AOC - (Air Operators Certificate).

APT - (Airport).

Arrival Time - Always given in local time of destination.

ARS - (Airline Reservation System) used by airlines to manage ticket sales.

ASK or ASM - (Available seat kilometers or miles) number of seats
for sale multiplied by distance of flight.

ATC - (Aircraft traffic control).

BAA - (British Airports Authority). Owner of several major UK
and International airports.

Block Spacing - Allocation of flight seats sold through another airline.

CAA - (Civil Aviation Authority).

Carrier - Airline.

Charter Aircraft - Flight hired by one or more operators. Most
seats are sold in seven or fourteen night accommodation
packages. Passengers are unable to change booking.

Circle Pacific Fare - Fares offered by some carriers to the Pacific
Rim (Australia, Asia, North/South America) usually with four
stopovers, travelling in only clockwise or anti-clockwise direction.

City Pair - The origin and destination cities of a flight.

Code Share - When one journey is given two flight numbers because
it is jointly operated by two airlines.

Conjunction Tickets - A set of tickets – issued at the same time
to cover an itinerary.

CRS - Computer reservation system.

Deadhead - A non-paying passenger or a flight with no passengers.

Denied boarding compensation - Payment made by an airline
to passengers when confirmed reservations are not honored
(often due to overbooking).

DES/DESI/DESIG - (Designator) A unique code given to each airline.

Direct Flight - Is a flight that can make stopovers prior to its
destination, but passengers do not disembark.

Fast-track - Is an Express transit facility for First and Business
Class passengers.

Flag Carrier - An airline designated by a national government.

Funnel Flight - A flight operated by more than one airline but identified
by the designator and flight number of only one of them.

Flight Number or Designator - A unique code for each scheduled
service. First two letters indicate the carrier or airline then several
numbers identifying the route.

Joint Operational Flight - Is when more than one airline operates
a flight.

Landside - An area of airport before passport control. Landside can also be defined as the areas of the airport which do not require passengers to undergo full security screening to gain access.

Layover - A scheduled interruption of a journey, usually overnight.

Long Haul - Flights exceeding four hours.

Loyalty/Rewards Programmes - A system of benefits offered to
business travellers to encourage repeat custom.

MCT - (Minimum connecting time) The time needed for a passenger
to change planes at any airport.

Movement - Arrival or Departure of flights.

Multi Sector - A journey with one or more transit stops (sectors).

Originating Flight - Outward journey – as indicated by flight number.

PAX - (Passengers).

Piece System -The baggage allowance in numbers of item. The letters
2PC indicates the traveller can check in two cases of bags.

Pitch - The legroom on flights, the greater the pitch the greater the

Pre-Clearance - Is when customs and immigration clearance for a
destination is made available prior to departure.

PNR - (Passenger Name Record). A unique code for each reservation
made on a global airline reservation system.

PTA - (Pre-paid Ticket Advise). A notification that a passenger's ticket
has been paid for by someone else.

Recline - How far a seat pitch pushes back.

Red Eye - Flights that land early morning after an overnight flight.

Rotation - Return journey.

SAD - Is the code for a shared airline designator.

Sector - A single leg between stops on an aircraft journey.

Short Haul - Flights that last for less than four hours.

SKD/SKED/SKEDS - Abbreviations for schedule.

Slot - A set time when runway is assigned for a flight to take-off or land.

Standby - Is the situation when a traveller without a reservation
is waiting for a seat on a flight to become available. The passenger
is usually asked to report to the gate shortly before departure.

Stopover - When a traveller leaves the airport and returns
shortly to continue the journey.

TC - Transfer connection.

Terminating Flight - Inward journey as indicted by flight number.

Traffic Conference Areas - (TCA's). IATA's classification of the
world's major airline routes: TCA1 = North and South America.
TCA2 = Europe and Africa. TCA3 = Asia and Australasia.

Transit Flight - Air journey between parts of an airport while en route.

Transit Time - Non-flying period of aircraft while in operation.

Turnaround - The time taken between an aircraft landing and taking off.

UTC - (Universal Time Coordinates) same as GMT.

Wait-listing - When a flight is full but a traveller waits to be notified
if a seat subsequently becomes available.

Weight System - The baggage allowance according to weight.

Wide Body - Aircraft with two aisles in the passenger cabin.

Zulu - Same as GMT.

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