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.

As EXP, I've sat in 1A several times....by selecting it directly within the CX website.

Heads up....for first name try just your first name. If it doesn't like it try first name middle initial and then first name middle name. No spaces. CX is a little odd sometimes that way. So if your name is John Adam Jones, try JOHN, then JOHNA then JOHNADAM until they let you in.