Originally Posted by
Leopold
You constantly ignore the fact that this is one ticket that involves multiple airlines and travel to the USA. In those circumstances, stopovers are completely irrelevant. Per IATA, the MSC rule applies when determining the baggage allowance for the entire ticket. And per the U.S., the baggage allowance for the first segment is the minimum for all segments on the ticket.
For travel to USA the 1st marketing carrier chooses whether to
(a) apply its allowances or
(b) apply those of the MSC
For (nearly) all other itineraries , the MSC is applicable; for US, it is dependant on what the carrier chooses to select
I have quoted the rules verbatim from Cathay's website ( see
http://www.cathaypacific.com/cx/en_A...r-journey.html ) which provides quite decent details on the rules