The Most Significant Carrier Rule of IATA

February 21, 2015

For the carriers which partner with each other on the basis of codeshare or interline agreements, the baggage allowance rules depend on which of the carriers involved in the Most Significant Carrier (MSC). For the identification of MSC, IATA has divided the world into Areas and Subareas. This division is presented below:

IATA Area IATA Sub Area
North America, Central and South America, Hawaii USA, Canada, Mexico
Central America
South America
Europe, Middle East Europe
Middle East
Asia, Guam, Southwest Pacific Japan, Korea
Southeast Asia
South Asian Subcontinent
Southwest Pacific


MSC will be the one which is the first carrier flying between two areas, or, subareas, or, first to cross international borders within a subarea.

But this rule does not apply to flights to/from/through USA or Canada. In this case, the baggage allowance of the marketing airline will be applicable. This is the airline which is listed at first in the ticket.

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    Posted on May 13, 2017

    We have 15 days’ Europe tour programme starting from Kolkata International Netaji Subhas Chandra Bose Airport (CCU) to London via DOHA by Qatar Airways. The journey will begin on 21-05-17 and return journey is on 04-06-17 from Rome to Kolkata (CCU). Our travel Agent is THOMAS COOK who has arranged everything wright from VISA, purchase of Air ticket, Hotel booking, 3 meals everyday including breakfast and other complete expenses except personal purchases.
    However, my question is what are the 1) free checked-in baggage allowances for Economy Class passengers and how many numbers and 2) cabin/hand/carry-on baggage allowances with how many nos.? In the air ticket, it is written as baggage allowance is 45kg.Whethwe this includes carry-on luggage also? Please clarify my querries as we are confused from your website. This is urgent.

    • baggagematters

      Posted on July 12, 2017

      Our apologies for being late to reply. Beginning August 2017, we will be relaunching our regular question-answer services. You can also book flight tickets with us now.