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Glossary for the airline industry

Definitions and explanations of common terms in the airline industry


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An amount used only with specified/published international fares for the construction of constructed/ unpublished international fares.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Category 105, used to define the rule conditions for the constructing of unpublished (constructed) fares.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.


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.

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.


Application Programming Interface


A small application that performs one specific task, typically running under the control of a larger application, such as a web browser.


The fares (or rates) that may be combined with an international fare (or rate) published to a gateway to create a through-fare. Arbitraries may not be sold separately for travel and are usually published between points within the same country. Also referred to as add-ons or proportionals.

arbitrary bucket

The text that defines fare class combinability. Arbitrary buckets may be fare class specific, generic (such as A***** and B*****), or default (******). The default bucket is often referred to as the negative or six-star bucket.