Jumping in on the legacy discussion. As long as I'm an FO, I'm going to keep the bait out there to see what hits. Now, they haven't called yet, but you never know.
Gaining seniority here is predicated on growth. Will the planes keep coming, probably. There is a chance there could be a hiccup down the line for any number of reasons. Gaining seniority at a legacy is predicated on retirements. Will pilots have to retire, yes. There is a chance that age 67 could pass and we kick the can for 2 more years.
Not to mention all the benefits that are slightly better (pay rates) to quite a bit better (LTD) that add up over the years. I'm a commuter, so I'd be doing that anyway. Now, once my number is called to upgrade, that'll make it a very hard decision to leave.