I fly AA more than I fly CO, but I am resigned to not having an Admirals Club in my home airport, SAT. For that reason, I hold a Priority Pass so I can access the Presidents Club when I fly AA. BTW, EXP's with AA can use the Mexicana Club in Terminal 1, but this benefit is next to worthless on AA as Terminals 1 and 2 (where CO and AA are located) are not connected behind security. I have used the EXP card when I am flying NW, which is based out of Terminal 1. CO's departure from Skyteam will bring a substantial reduction in my NW flights, further reducing the benefit of EXP access to the Mexicana club.

AUS does have an Admirals Club, FWIW.