I know two that started at USAir, one at United, one corporate, several at JetBlue, one at Spirit, and two at a 121 nonsched operator. I have also talked to several regional FOs who have made lateral moves to other regionals for various reasons. This shuffling near the bottom of the list might account for as much or more attrition than hiring for the majors does at this point.
Just my observations from the cheap seats.