SkyWest FO here, been trying to get on with JetBlue for three years now.... I can't begin to tell you how many captains that I fly with who don't want to go to Spirit or JetBlue because they have been at SkyWest for five years or more and feel that an LCC is below them...I have lost count. It doesn't bother me though. I hope that they keep thinking like this so that people like me who want to get on have less competition.