If your flight has a section with a partner airline, IATA regulations for baggage allowance applies.
This regulationindicates the following:

  • If baggage allowances for both operators are the same, this rule applies.
  • If baggage allowances are different, the most important airlinepolicy applies (Most Significant Carrier). The most important airlineis defined by the IATA.

To understand who the most relevant operator is, IATA divided air traffic into three areas:

  • Area 1: North America, South America, Central America and Hawaii.
  • Area 2: Europe, Africa, Middle East.
  • Area 3: Asia and Oceania

The most important airline will depend on the intersections which airlines made in the following order:

  1. First operator who cross from one area to another. Example: the operator who cross from America to Europe.
  2. First operator who cross from one sub-area to another.  Example: the operator who cross from South Americato North America.
  3. When traveling within a sub-area governs the first international operator of that area.Example: a flight from Ecuador to Brazil applies the first international operator.

Air Traffic Division, according to IATA

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Exceptions:

  • When the origin, destination or farthest point of a ticket is a place of USA, baggage allowance of the first flight will apply to the entire route, no matter if the ticket has a stop (stopover).
  • In case of code share flights that include a point in USA, the most relevant operator will be the airline that sold the ticket.