A displacement bid is when the company eliminates a position either a base closure, fleet type shrinking or going away entirely. They will try to do things slowly and just stop putting people in the position but at some point they have to force people out to a new position. Assuming the crj goes to psa with additional 175 options coming online. They would displace off the crj to the 175. But it's not that simple because if a senior fo on the crj wants to go to the 145 in NY that means now a Jr fo on the 145 gets displaced to maybe ord or the 175. Its a chain reaction until the most Jr few are left with what ever position is leftover. The company doesn't like to do it since it causes many training cycles and Jr people don't like it because they get shuffled around.