I'm not sure whether or not it's worth writing MPC or not. A couple of my friends are flying HAN-HKG-LAX in July (in Y) and they have 2 small kids, so it's a tough flight. They are wait-listed on one segment, and I'm not sure if it would help if I wrote MPC to ask if they could "give them some consideration" or something like that to get them off the waiting list. Would they be likely to help??