I worked as a seasonal helper thru Dec 24.. I said I was interested in working as a package handler in the hub and the HR person put my name on a list. Yesterday they called and asked me if I was interested in working morning shift starting 6:45am. I said yes and I was scheduled for a 'tour' Tuesday morning at 6:00am.. does that mean I will start working??
They don't just put your name on a list because you say you're interested. They put your name on a list because the driver said you did a decent job (like I did this year for my helper) and yes that gives you preference over someone from the outside.
However, just because you were called for a tour doesn't mean it's a done deal. When they have openings they call people in for a group tour. Applicants then often realize that after union dues and taxes they barely make like 20 bucks to work a shift and after gas to get to work they're left with $10-15 for the day.
After the tour, they'll then usually have an informal group interview, after which some people may be asked to stay for a 1-on-1 interview or be called back for a 1-on-1 interview another day when a supervisor is available.
If you get through all the interviews and they like you, you still have to pass a background check (not sure if they do another one this soon after doing one for driver helper).
Once you get through all that, they still might not call you for a couple weeks or a couple months. In summary, it's a good sign to get a call to come in and you have a better shot than someone who hasn't been a helper before.