Stumped by industry jargon? Here are the definitions and
explanations to make it all clear.

T/C Lock

Tariff/Carrier Lock. A feature for US/CA fares that may be set for a batch with action type Apply or Release.


A group of data elements. See supporting table for a list of table numbers and names.


In the Fares system, defines whether a fare can be used as a one-way fare or a round-trip fare.

Tag 1

1. (domestic US/CA fares) A one-way fare. 2. (international fares) A one-way fare that may be doubled and halved (can be used in one-way, round-trip, circle-trip, and open-jaw pricing units).

Tag 2

1. (domestic US/CA fares) A published round-trip fare. 2. (international fares) A published round-trip fare (may only be used in round-trip, circle-trip, or open-jaw pricing units).

Tag 3

(international fares) A one-way fare that may not be doubled and halved (may only be used on one-way pricing units).


1. A database that contains data defined by system, geographic scope, and distribution process. 2. Information filed with governments when a legal filing is required.

Tariff number

Geographic areas of the world are assigned tariff numbers and names. Fares for markets within that geographic area are distributed with the assigned tariff number.

Tariff owner

The organization identified as the owner of the tariff.

Tariff-owner tariff

A tariff where the tariff owner is an organization that may be different from the carrier whose data is in the tariff.

Tax Summary

Formerly the Ticket Tax Box Service (TTBS), Tax Summary is an online display of current and historical taxes, fees, and charges for up to two calendar years.


Traffic Conference.


1. Transaction control number. 2. ATPCO's Ticket Exchange Service.



Terminal points

Fare break point; the ends of a fare component. Typically used when a fare has not yet been assessed for the fare component.

Through fare

A fare applicable for travel between two consecutive fare breakpoints via an intermediate point. A through fare can be a published/specified fare or a constructed/unpublished fare.

Ticket-related services

An optional service that must be associated to a specific passenger ticket, though not necessarily a specific flight. For example, a service for lounge access might be provided only if the passenger holds a ticket confirming travel into or out of the airport where the lounge facility exists.

Ticketed point

Point shown in the "good for passage" section of the passenger's ticket. Can be a connection, stopover, or fare breakpoint.

Ticketed point mileage

The number of miles between pairs of cities as published in the Ticketed Point Mileage Manual.


The issuance of an accountable document, which serves as a record of the product purchased by the customer, and gives a record to all airlines involved in the itinerary of the services paid for and expected to be delivered.

Ticketing airline

A ZED/MIBA member that issues reduced-rate tickets to its eligible persons according to the ZED/MIBA agreement for transportation over the routes of another party (or parties) to the ZED/MIBA agreement. See also transporting airline.

Ticketing amount

The amount on the passenger coupon in the Base Fare Box.

Ticketing code

A code used to replace the fare class code on the ticket when it is issued and possibly on the fare display.

Ticketing Fees

ATPCO product that provides a standard process to instruct pricing systems on how to collect ticketing and credit card service fees on a carrier's behalf when they are the ticketing or validating carrier. This product supports both public and private distribution needs and provides options to define fees by passenger type, journey, fare basis, and date.


Travel management company.


Ticketed point mileage.


A fare record. A set of data defined in a fares batch that determines the components of a fare.

Transaction file

Records in a batch that have not been updated.


Transportation between the 50 US states, including the District of Columbia and Canada.


A change of service from the service of one carrier to the service of the same carrier (online) or to the service of another carrier(interline). This includes stopovers and connections. See also interline transfer.

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.


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.


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