I know exactly what you are saying and understand your plight. It's probably happened to me before I worked at AA and I always commuted on AA when I was an offline jumpseater at the regionals. It probably is something that could be looked at. From the AA pilots' perspective, it looks like the flight is completely full, so we go talk to the gate agent and tell them we are the listed jumpseater. Many times, they just print out the 1W right then and there. If the OAL pilot has not checked in with the gate agent yet, we cannot see the D6U yet. We can't even see if they have made a listing. The D6 can only check in with a person. So if I already have the 1W in hand, I'm unlikely to look at the standby list again and see that a D6U has checked in. Say there are 5 seats open, and I, as the online jumpseater is listed as No. 6 on the standby list for non-revs. Most of us just say we'll take the jump, screwing over the D6, and simply not realizing there's another offline pilot wanting on. If there were a way we could see the not checked in D6's this might help offline jumpseaters get on. Sorry, this is happening to you, OP. I think it's simply an oversight that most of us don't think about.