Originally Posted by luckypierre
i gather you are suggesting that i use the explat aa number on the ticket until it becomes apparent that an OpUgrade is unlikely, then have an agent change it to the asiamiles
Exactly. That's how I've been able to enjoy a couple of op-ups as I accumulated miles on MPC. In my (limited) experience, the op-ups were decided by the time I checked in. Having the FF number changed in the CX lounge haven't made a difference to me. (But I've heard of cases where the op-up was at the gate.)
Another bonus for me was I got to escape BAEC's stingy policy on discount economy tickets.
Good luck with your trips.