Originally Posted by cxfan1960

A CX Silver can access a CX or a CX-designated lounge if flying CX and KA only (but not other OW flights). No guest is allowed. AA PLT is better than CX Silver unless the member is flying CX and KA most of the time and wants to have CX lounge access.

In coach, only Y, B, and H (not M) CX booking classes can earn miles on AAdvantage.