News to me ... I don't doubt you...
What about the other facit of the DOT exception I just referred to? (Entire booking, not per 'journey')
The DoT exception has not changed at all. From April 2015, a number of changes came into effect. The two changes that are public-facing are:
1. Canada's CTA decided to follow the US DoT's exception rules. That means the US DoT exception now applies to tickets where the furthest ticketed point is in the US or Canada.
Note: beware of RTW/circle type tickets, just because it involves travel to the US or Canada, it does not always mean the US DoT exception rules apply.
2. IATA amended resolution 302 with a number of changes, though the main one the travelling public would be affected by is the change from most significant (operating) carrier to most significant marketing carrier.
3. IATA also clarified situations where a single journey traverses two different conference areas, eg. TC3 -> TC2 -> TC1. Example routing: SIN QR x/DOH QR x/LHR BA JFK. In such a situation, the marketing carrier of the flight that does the last conference area traversal is deemed the most significant marketing carrier for this journey. In this case, it's BA.
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Personally, I think using most significant marketing carrier makes a lot more sense and is less confusing for the public. If you booked a ticket with BA, you shouldn't need to go hunting for CX's rules on a BA*CX segment (eg. the BA codeshares on AU-HKG vv.) ...
CX's baggage rules page was updated last year to reflect these changes:
Check in baggage - Carrier rules | Baggage information
That page is probably the best out of all airline pages for explaining the current rules.
Thanks madrooster
Now I can tell the better half she can't go shopping until LA
CJ
Pleased to have helped your cause!