I think we all understand the courtesies involved in traveling as a jumpseater.

If you have a ticket, AND you are entering by the door closest to the cockpit, it would be appreciated if you would stick your head in and say hi to any pilot if you can do so without interupting something that looks important. Mention that you're traveling on a ticket, and offer to help out if needed.

If you are NOT at the door closest to the cockpit, no need to swim upstream, especially on the 747, unless you are seated on the upper deck anyway. Do mention your status to a FA.

Joe