I'll be flying on CX and AA quite a bit next month.
The CX legs all show under my MPC account and I can change the seats to my liking.
For the AA flights I can select seats, however the ones I like better are all blocked. Tried via my TA to get them released but didn`t work. Call AA?

There is one JFK-HKG leg that is ticketed by AA but operated on CX, for this one I can't even select a seat, call AA as well?