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Glossary for the airline industry

Definitions and explanations of common terms in the airline industry

coding conventions

A set of manual standards established to provide consistency in coding data. (A coding convention is not an actual programming edit.)


Whenever two or more one-way or round-trip or half round-trip fares are used and shown separately in a fare calculation. See circle trip, end-on-end, half-round-trip, open jaw, and round-trip.


An agreement requested of a carrier by another carrier to make tariff changes. A blanket concurrence (also called a preconcurrence) may be secured in advance to cover all future changes.


1. When a passenger changes planes within a fare component, and the duration of the change is not considered a stopover (established by carrier rules or industry default) (see stopover).

2. Also known as a transfer. The ability to transfer passengers, baggage, cargo or mail from one flight to another within a reasonable time period. On-line connections concern transfers between flights of the same airline designator and interline connections between flights of different airline designators.


IATA term for unspecified through fares created by the use of add-on amounts, or two or more fares shown as a single amount in a fare calculation. (ATPCO also refers to this as unpublished.)

continuous pricing

A method of dynamic pricing that is fully dynamic, choosing a price from a predetermined range or directly linking to an airline's revenue management system. This method does not depend upon predefined prices.

contract of carriage

An agreement between a carrier and a passenger that lists all the rights and responsibilities of each party.

criteria set

Fares system tool used to view, add, modify, restore, and cancel fares. Also referred to as the query tool.


Computer reservation system. Used by travel agents and others throughout the world, these systems receive coded fare data (which will price electronically) from ATPCO and transmit it to their customers.


Canadian Transportation Agency.


Abbreviation for carrier.

data application

The industry-endorsed processing laws that apply to ATPCO data for itinerary pricing solutions. Data application creates an industry standard aligning ATPCO, data providers, and data subscribers for consistent industry-wide itinerary pricing. Now part of Industry Standards.

Data Distribution (G30)

Directory that controls which organizations (subscribers) receive what public and private data from ATPCO for processing. Now replaced by the Data Distribution Control.

Data Distribution Control

The replacement for G30 Distribution Control for fare and rule data.  DDC is a key feature of distribution where data providers indicate which subscribers are eligible to receive their data, and access may be controlled at the Carrier, Tariff, and Rule level.

data owner

The carrier who owns the fare products.

data provider

The organization that contracts with ATPCO to file fares, rules, and other data in its own files under its own control.

data table

A table used to house rule provisions in the FareManager Rules system. See also Record 3.

data table set

A series of data tables within the string between a THEN data table to the next THEN data table or ELSE data table.

data table string

A series of 1 to 200 data table numbers and the relational indicators contained on the recurring segment of the Record 2.

data table subset

A series of data tables in a string that can stand alone to validate the fare component. Generally this is equal to one Record 3 table when tables are strung with OR. It can also be a group of tables which constitute a unit of thought when there is an AND relational indicator. Subsets include the following situations: THEN, AND THEN (when the next table is OR and there is no 'If' condition) THEN, IF THEN, AND, IF THEN, IF, AND THEN, AND, IF, AND ELSE, AND OR ELSE