All,
CX would not be allowed to carry jumpseaters on the freighter on international flights to and from the US. FEDEX and UPS are not allowed to do it right now either. POLAR and Atlas can, if you are in CASS, which CX pilots do not have access to. You must understand that jumpseating in the US is governed less by company policy (which before 9-11 it was) and more by the TSA and FAA. CX could offer cabin jumpseats, but in my experience, few if any foreign airlines offer that. some offer the ability to sit in FA jumpseats if the flight is full but you still have to have a pass like an ID 90 and use it.