What's better, keeping miles with Cathay or AAdvantage using AA
BTW this info is not for me. I'm helping out a friend who's flying to Asia on a regular basis on Cathay. They have been accumulating miles on their Marco Polo program for about a year and have ruby oneworld status.
Is there any benefit to using their AAdvantage account (no elite status) or just keeping with the Marco Polo program?
Thanks!