This is a recent development due to destinations being covered by other aircraft (330 mainly), bases closing, and fleet retirement on the horizon. In 2014-2019 the 7ER had very little movement. FOs at 75% vs the MD88 at 25% after 5 years.

The CA seat in NYC went very junior the last bid. I suspect now that the floor has been set, the bottom pilots will be there for a very long time as people bid in on top of them.