I just started having to commute to work and I was wondering if anyone had some insight or experience with being at the gate about an hour or more before the flight and while the gate agent is busy and tells you to come back and list for the jump seat when they are done working another flight. In the meantime another pilot walks up and asks to list for the Jumpseat and another gate agent accommodates them...

How could you guarantee your first come first serve priority if the gate agent isn't able to list you when you first show up and another pilot is getting listed shortly there after?

I don't want to stand around the gate and breath down their necks as they have a job to do but how do you make other pilots know you are waiting to list ahead of them.

Obviously this is only the case for when both of us are other airline pilots listing on another airline where a first come first serve policy is used for the Jumpseat.