Right now there are only 7 FOs total who aren't seat locked with bids in for the E175 with the most senior person on the list being just over 2 years. No one more senior than 2 years has a bid in for it right now. They haven't announced any new bids for it for a few months though. Usually when they update the vacancy report and announce they'll be awarding a class more people add themselves to the list. As of right now it's been going pretty junior though since the only base is ORD (which is very junior on the CRJ) and there are only a few limited routes. I'm sure it will go more senior once more bases are opened since the pay scale on it beats the 200 and 700.

Senior FOs who can hold 900 trips can probably credit more than the E175 guys so I'm not sure how many super senior FOs would want to bid over to it.