Originally Posted by Aeroknot

I'm a new guy starting class in a couple weeks. I've been flying corporate aircraft for the last decade and I'm trying to learn as much 121 info as I can on my own prior to starting. One thing that hasn't been made clear is the procedure for holding a base. Once you are assigned or bid for and receive a base, is that where you can expect to stay until you bid out of it or can a more senior pilot bump you out?