For displacement of FOs out of EWR to occur, the rate at which lines are taken out of EWR would have to be equal to or greater than the rate of FOs leave EWR (upgrading to CA out of EWR or transferring to other bases).
I don't work in scheduling or planning but I don't think it would be at all difficult for them to just close the door to EWR for FOs into EWR as the Q400s start flying. That way the FO attrition rate could work with the line decrease rate. Seems like the last FO to get EWR could be on reserve for a while.
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