Originally Posted by
Often1
Indeed, the allowance for this segment is the allowance of the marketing carrier, UA, for this segment and for all remaining segments of the ticket.
No! UA is not the marketing carrier for the first segment. UA award flights are
always booked using native flight numbers. The marketing carrier is LX — marketing carrier means “whose flight number is it?”. The issuing / validating carrier is UA, but that doesn’t matter at all.