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Glossary for the airline industry

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


Airlines for America.

accompanying passenger

The passenger who is travelling with the passenger on the fare being validated.

account code

A unique code assigned by each carrier that identifies a particular fare programs contracted with a company for that carrier. Carriers may have multiple account codes for a single company.


Airlines Clearing House.


An amount used only with specified/published international fares for the construction of constructed/ unpublished international fares. (Also referred to as an arbitrary or proportional fare.)

add-on category

Category 105, used to define the rule conditions for the constructing of unpublished (constructed) fares. Not used by the ATPCO automated fare construction process.

add-on zone

A component of an add-on record that defines the geographic area of the published fare with which the add-on will construct. Applies to international fares only.

adjusted pricing

A method of dynamic pricing where a dynamic pricing engine uses an airline’s unique business logic to apply dynamic price adjustments to predefined prices.


Agency debit memo; a notice from an airline to a travel agency that an error in remittance has occurred and money is owed.


A person who has reached their twelfth birthday as of the date of commencement of travel.


An entity that collects related items of content and displays them or links them together.


Artificial intelligence.

airline-defined tax

Tax codes that are specified by the airline and not assigned by IATA TTBS. 


A piece of standards work that involves a change in processing by at least one of the consumers of the standard.

all adds

A complete copy of an ATPCO data subscription product that is used by subscribers to initialize their database before processing changes or updates. All adds contains both effective and future effective data.


A unit of data that contains worldwide international and domestic fares, add-ons, footnotes, rules, and routing data, but does not include travel to or from Canadian or US markets.


See alternate governing rule.

alternate governing rule

A governing rule that applies only when specifically invoked by the fare rule. Alternate governing rules are not referenced in the Record 0. Also called alternate general rule.


One type of Routehappy Content, Amenities data describes features of the onboard experience, including seat pitch/type, Wi-Fi, power, and entertainment, in standardized data that can be compared with other offers. See also UTA and UPA.

ancillary services

Services and products associated with a fare, product, or offer; includes items such as commission-based products, checked bags, and assigned seating.