I cannot believe so many people are so confused by this! If you go
To the airport and have an agent list you/ checked in CASS at the gate you are jumpseating ( seat upfront, back, lav, belly). If you go list online on your own airline and have been charged the fees associated ( yearly, one time etc) it is non reving. This is sad. And gate agents are not in control when you jumpseat, ALWAYS check in with crew, if the flight is late it is the CSAs fault for boarding you so late.