weasil is absolutely correct here...always a good idea to have it! I almost got stuck in FL once - when I put in my resignation with TSA, they had taken me out of CASS at that very same moment without my knowledge. Had a couple days off and flew down to see a friend w/o my Passport...

AirTran FO on the way down was former TSA and talked the CA into giving me the Jumpseat...On the way back the gate agent wouldn't let me onto a Freedom flight - So I jumped out and asked the Captain...got to sit up front again. Just be courteous and always, always, always get down to the Captain.