Priority as MPC elite
 

Regarding priority check-in, boarding and baggage, for MPC gold/diamond status, I have checked the Cathay Pacific as well as the oneworld website, and from personal experience, that the benefits extend to travel companions, on Cathay Pacific and dragon flights. However, this is less clear if traveling on other member airlines. Can others share their experience (positive or negative) about this? Has anyone been refused priority for their companions?

JAL's definitely fine with letting me and my mate tag along with MPO DM for check-in, priority baggage and boarding.

Did with QR and MH and were all allowed for party of 4. (Me as GO and 3 companions)

Priority checkin allowed up to 4 pax on QR, and I’m only Silver.

Flown on AA from DCA to JFK, 2 PAX under same PNR allowed.(based on my experience)