Originally Posted by FrontOfTheCurtain

Withou any addional info, origin/destination, flight number and departure date the only advice I can give is this.

Depending on your OW status, there may be other options for you. Follow what AAExpDFW had posted earlier in this thread:

Call AA and ask for the CX PNR (it will be different than the AA one). Then go to cathaypacific.com and pull up your reservation that way. You can then use their seat maps to try and change your seat. CX is very good at reading your OW status and giving you access to those seats if you qualify.

Originally Posted by conde

As AAExpDFW and others have mentioned, call AA to obtain the Cathay Pacific PNR/Record Locator. Unfortunately, when entering that into the Cathay Pacific web site's Manage Booking section, all seats in First Class may appear to be taken, disabled with only 2D available.

When that happens, call Cathay Pacific's customer service, provide them your CX PNR with your other associated flight information. The Cathay Pacific customer service representative was able to reserve 1K (LAX->HKG) and 1A (HKG->LAX) in the First Class cabin for my AA award ticket (on Cathay Pacific). I did not have elite status with Aadvantage or Asia Miles/Marco Polo when my seats were assigned nor do I have elite status now.

It is possible that 2D is the only seat available, but make sure that a Cathay Pacific representative confirms that is the case, not an AA representative.