OW link--->
https://www.oneworld.com/ffp/sapphire-privileges
Extra baggage allowance*
As a Sapphire frequent flyer, the following special baggage privileges will apply when you fly on oneworld airlines;
- On international or domestic itineraries using the baggage allowance "weight" system - 15 kgs in addition to the ticketed Economy baggage allowance.
- On international itineraries, that include domestic sectors, using the baggage allowance "piece" system - one additional bag*, weighing up to 23 kgs, up to a maximum of two pieces.
- On purely domestic itineraries, using the baggage allowance "piece" system, for tickets with no ticketed baggage entitlement - the assurance of one piece of checked baggage, weighing up to 23 kgs.
If the flights have baggage on the weight system, 15kg would be correct.
I would expect this only to apply to the passenger with status, and not others on the same PNR.