95% of the airport TSA agents will let you through security with just your airline I.D. in or out of uniform. The other 5% will tell you to go back to the ticket counter and get a security pass. Just make sure to tell the TSA that you are jumpseating. I jumpseat out of SFO a lot and I've never had a problem with them letting me through security. I can't vouch for PNS, though!