OK so this is a very old thread, but ... I'm getting old, so there!
After loading trucks and airplanes for 3 1/2 years at UPS, I finally got the chance to jumpseat on them 3 years after I quit. Rode the 767 from SDF to PHX. After all those nights of running W&B's up to the crew, it was nice to finally be strapped in.
Two of us were jumping, the other guy a DC-8 driver who actually recognized me. He nudged me into the observer seat so I could get a better view of things climbing out, then I hopped back to the fold-down jump for the duration. CA and FO were great guys, we all pretty much did our own thing. I'm looking forward to doing it again someday.