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Glossary for the airline industry

From A-Z, this glossary covers definitions and explanations for common airline industry terminology.

transport product

Commercial atomic product between two stations that can be operated by aircraft as well as by other transport vehicles such as trains, buses, etc.   

transporting airline

A ZED/MIBA member that transports eligible persons of the other party (or parties) according to the ZED/MIBA agreement. More specifically, this is the airline whose carrier code appears on the flights to be priced and ticketed using ZED/MIBA fares. In the case of S/A/Fs and (if bilaterally permitted) code shares, this may be different from the operating airline. See also ticketing airline.

travel segment indicator

Codes that define a specific portion of travel. They may be used alone or in combination with geographic locales to specify the application of a provision. These codes are listed in Data Application Appendix H.


A portion of an itinerary between two consecutive fare break points (used in domestic tariffs). Also called fare component.

true currency

Any currency found in Appendix D that is not Universal Mileage Currency code XXX.


Travel segment indicator.


Ticket Tax Box Service. See Tax Summary.


Farthest geographical fare break point on the pricing unit, measured from pricing unit origin. Not applicable on a one-way pricing unit. Also called point of turnaround.


User-defined group.

unavailable tag

A tag attached to Record 1 stating that the rules are incomplete or cannot be used for autopricing.


1. The status assigned by the system to provisions that have been updated but have not yet been processed through GFS and subsequently sent in Subscriptions. See also filed data.

2. See non-filed.

universal mileage currency

Currency code XXX used to file mileage awards


Unaccompanied child (usually age 5-11 or 8-11).

unpublished fare

ATPCO term for fares constructed by adding specified and add-on amounts together. Also called constructed.


Universal Product Attribute. One type of Routehappy Content, UPAs describe fares, products, and services with visual messaging, images, videos, and cabin tours. See also UTA and Amenities.

update errors

Records in batch processing that do not pass update. The update step applies the fares to the master file. If there are difficulties, then the fare will not be applied to the master file. Instead, it becomes an update error record. Update errors occur, for example, when a carrier tries to increase a fare that does not exist, cancel a fare that is already canceled, or add a new fare that already exists.


The United States and Canada.

US/CA domestic fare

Fares that are published for travel within the continental United States, between the continental United States and Alaska/Hawaii, within Alaska/Hawaii, between the 50 United States and Canada/Puerto Rico/Virgin Islands, within Canada/Puerto Rico/Virgin Islands, or between Canada and Puerto Rico/Virgin Islands. Also called local fares.

user ID

The seven-character user name for access to ATPCO systems.

user-defined group

A group of conditions, similar to inclusive tables, created in order to speed processing for frequently used fields (location, routing, rule, footnote, and market) in a query.