Originally Posted by
Globaliser
Cabin baggage limits have always been by the operating airline's rules, not the marketing airline's.
Really? I think the US Department of Transportation disagrees with you.
See:
DOT Issues Guidance on Airline Baggage Liability and Airline Responsibilities for Code-Share Flights | Holland & Knight
To paraphrase AA can not apply BA's rules on an AA marketed flight, where BA is the operating carrier, UNLESS AA discloses them in its rules tariff, contract of carriage, and website. - A statement that the 'operating carriers rules apply, without detailing any difference, is not acceptable.
All of BA's code share partners must disclose every term in which BA's rules differ from those of its code-share partners.