Thanks J_M:
The company I work for just got into CASS, so I am still a little vague about the details.
Jumpseat agreements: I checked with my USAirways gate agent where I live. He printed out a list of airlines who have a jumpseat agreement with them.
Cathay Pacific was on the list as CX. There is an access code that you can give gate agents to verify you.
Of course, this applies to cabin jumpseaters and not cockpit. Its a good deal nonetheless, especially with an airline that covers so much ground.
Thanks again,
Sky