Originally Posted by
Leopold
You do not understand the rules. For a multicarrier ticket, a violation of IATA rules happens when any of those carriers ignores the MSC concept. It does not matter whether the ticket includes travel to or from the USA. The U.S. government has nothing to do with IATA rules.
I am fully aware of the rules and know that the luggage rules for USA are as stated as per the CX site. Some airlines apply their own allowances, some defer to MSC. What is required for travel to the USA is that the luggage allowance stays the same for the entire trip
The explanation given on the CX site is accurate