I have a good friend who intended to be a Blue guy for life, but left as one of the few AA OTS hires after he took a close look at the long-term career progression options at both places. 2011 hire, E190. Of the FOs I've been flying with, guys with local ties to NE/BOS seem to be staying put, while guys 35 and younger seem who commute seem to have their apps out to all the big three. Most all enjoy it here (except when I tell them not to clean, TIC), but the career metrics are pretty hard to ignore if you're young, junior, and commuting to one of our bases. Even BOS 320 FO is becoming somewhat stagnant progression-wise; lots of 2-year 190 guys jumping over and the top 60 or so mostly live in base and aren't upgrading until they can hold a decent line as 320 CAs. The 320 RSV grid for BOS CAs is much thinner than it was most of January and December though, so maybe there's some hope for upgrades on the March bid.