Main category

A description of the category of the rule that controls the requirement. See also qualifying category.

Major subcategory

One of four main subcategories of Category 10 (101-104) that states provisions for specific combination types. See circle trip, end-on-end, open jaw, and round-trip.

Market

The city which is the origin or destination point of a journey.

Market pair

The origin and destination cities of a journey.

Marketing carrier

The carrier code that will appear on the flight coupon of the ticket (typically used for code share).

Master source

The ATPCO database.

Match

The data that is used to determine if the record or table is applicable.

Match criteria

Portion of a query coded to find fares and use that fare amount.

Maximum permitted mileage

The maximum number of miles that may be traveled for a fare component without incurring a mileage surcharge.

Merchandise services

An optional service that is not associated to any passenger travel or ticket. Such a service may be priced regardless of whether the customer is holding a passenger ticket. For example, a carrier might offer logo T-shirts for sale, whether or not a ticket exists.

MIBA

Multilateral Interline Business Agreement for airline company business travel.

Mileage currency

Currency code XXX used to file mileage awards

Mileage-based fares

A fare that is not governed by a designated routing map, but instead by a maximum permitted mileage (MPM) restriction.

Minor subcategory

One of four qualifying subcategories of Category 10 (106-109) that states restrictions on combination types.

Mirror image

(Subcategory 102, International fares) A round-trip pricing unit consisting of two fare components, half of a round trip (Tag 2 fare) using the same Tariff, Carrier, Rule, and Fare class code on both components, and where no differing mileage and/or HIP surcharges exist on the pricing unit.

Modify fares

A function that allows fares to be amended or canceled within a fares batch.

Most significant carrier

1. The carrier whose baggage rules will apply on journeys. 2. For journeys that are required to follow DOT reservations, it is the first most significant marketing carrier on the journey, as determined by these conditions, and charges for these journeys are applied per direction: a. For travel between two or more Tariff Conference areas, the carrier performing carriage on the first sector on the passenger's journey that crosses from one area to another. Exception: TC123 only, the carrier providing carriage on the first sector on the passenger's journey that crosses between TC1 and TC2. b. For travel between Tariff Conference sub-areas, the carrier performing carriage on the first sector on the passenger's journey that crosses from one sub-area to another. c. For travel within a Tariff Conference sub-area, the carrier performing carriage on the first international sector on the passenger's journey. 3. For all other journeys, it is the most significant operating carrier for each checked portion, and charges for these journeys are applied per checked portion: a. For travel between two or more Tariff Conference areas, the carrier performing carriage on the first sector on the checked portion that crosses from one area to another. Exception: TC123 only, the carrier providing carriage on the first sector on the checked portion that crosses between TC1 and TC2. b. For travel between Tariff Conference sub-areas, the carrier performing carriage on the first sector on the checked portion that crosses from one sub-area to another. c. For travel within a Tariff Conference sub-area, the carrier performing carriage on the first international sector on the checked portion. d. For travel within a single country, the first carrier on the checked portion.

MPM

Maximum permitted mileage.