Originally Posted by nws2002

Former GA here. Go to the ticket counter if you can, gives them time to find someone to figure it out. When they changed over the check-in system from AIS to G4+ it made listing JS more difficult. They may have to locate a more experienced agent to do it or call Customer Ops to do it for them.

They should be able to do it at the gate, and they're supposed to have the jumpseat form there too. However, many times the gate is only staffed with a single agent. If they're busy (or lazy), and the crew doesn't force the issue, you might not get on because they don't want to take the time to do it.