For the record, IATA 302 is based on the "Most Significant Carrier" for a journey which may or may not be the operator of the longest segment. It is more to do with those flights that cross IATA region/area boundaries.
Allowance is based on the Operating carrier of the defined MSC segment. The can be more than one "journey" in a booking and allowances can vary between journies within the one booking.
Note for travel to/from the USA there is a DOT exception where allowance is generally based on the Marketing carrier for the defined MSC segment and the first allowance applies to subsequent journies on the entire booking.
Last edited by serfty; Jan 17, 2018 at 2:12 pm