Remember, I'm talking about the feeder bid. It wasn't an annual bid when I was in package car. Every May, they bid all of the routes, from sleeper teams, mileage runs, hourly runs, variable cover jobs (which pick vacations, week-to-week) and bid cover jobs (which are cover jobs at a time slot, meaning your job is simply a time slot, so you cover call-ins, optional days, and whatever comes up at that time slot).
In feeders, especially in a very big feeder department like ours, the bids are continuous. Outside of the peak period, it is rare when there is a week when there isn't a bid on the board. Every move has a ripple. For example, a few weeks after our bid was complete, one of our mileage guys retired. So that one move will ripple for months. At the end of the week, someone will get his job, and that winning driver's job goes up for bid the following week. It only ends when an unassigned driver gets a job, because obviously, that driver didn't have a job.
What this means, is typically, the highest seniority drivers tend to keep the best jobs. By best jobs, I'm speaking of mileage runs, day road jobs and bid cover jobs. But in general, most drivers know about where and what kind of jobs they will be able to keep with their individual seniority, and as such, usually will be able to keep their job for the year.
The one exception, is when someone's job gets changed in some way, or gets eliminated, that driver gets a bump. And then it starts all over again.
It might sound bad, and it can suck getting bumped off your job, but guess what? You just ride the ripple, and take your bump and find the next best job. It happens to everyone at some point, but it's just part of the job. I was in the middle of a 300 driver list for over two years before I got bumped for the first time. I was a little bummed at first, but then I bumped into the variable cover list, and I loved it, and never looked back.