Originally Posted by
aacharya
You bring up a good point, but the IATA regulations are pretty clear in that the Most Significant Carrier allowance applies throughout the itinerary (not a particular flight segment). US DOT regulations then define MSC as marketing carrier if touching the US.
Might be interesting to see what the United.com baggage calculator says for the outbound.
So if the OP has a UA PNR, I imagine the flights are booked as a codeshare on LH metal, then would UA be the marketing carrier and thus the MSC? I could totally imagine UA saying that the OP doesn't have the business baggage allowance.