NK sure.

F9 is small, with uncertainty as to what management ultimately intends in the long run. Probably a better place to be in the future than the past, but a young guy probably won't retire from F9. I'd consider them if you absolutely have to be in one of their bases (DEN anyway, not sure how stable the other bases are) and aren't competitive for other airlines. And the F9 contract still lags the middle and top tier majors.