One caveat to observe. I have experienced when traveling AA domestic, crediting to AA as per reservstion, and printed on the BPs, but gaining access to lounges with my BAEC Gold card, is that the computer overrides reservation info and automatically credit flight(s) to AA.

Don't know if CX's using similar software, but may be good to know about thos loophole. Asking lounge/gate agent to check crediting FFP after a lounge visit could be helpful