...choose the 145 if able. if for some reason you were awarded dfw or lga, you will be able to transfer to ord if you're on the 145 - if your seniority can hold it.

if you choose the crj, you will be based in ord but will be displaced out of it as the crjs are being transferred to a different carrier. that means you will go
through another long term training.

175 will only get you dfw for now!

good luck