unpaid days off are weird here. It is NOT by seniority, although mgmnt tend to lean towards giving senior drivers the day first when they ask the morning of.
We have a dispatch board that shows who is doing what for that day prob like every center. There is a slot for "available/free" drivers, which is normally where extra cover drivers get put for the day off or to work if something comes up(no show). Of course they have the option to bump depending on seniority if they want to work.
This is where it gets weird... pcm is generally at 8:20 here, the drivers that are free usually sneak around and stand in the back of the pcm hoping that no one notices they don't have a diad. Because here, everyone wants the day off, and the more routes you know, then the more bid drivers you have coming up to you wanting you to cover their route so they can take the day.
If you call at 720-730 in the morning to see if you can take an unpaid day, usually you can get it if they have free drivers. This has to be done with some discretion and not too often.
Sorry this it totally off topic, it's just weird seeing how much different it is from center to center.