Knowing my own reasons and some (very senior) guys who left, it boiled down to terrible, careless leadership. It never got better, only worse. Short term house of cards. Buy trashed out airplanes, contract out maintenance to lowest bidder, churn and burn employees (high turnover=cheap wages). Inexperience and associated incompetence and low morale permeates every corner of the operation. Same fast-buck basic ingredients as Valujet. Social deviants and outcasts hiring more like-minded 'yes men' into positions of authority to make lives miserable and ensure more of the same. It's no wonder it's such a mess. People leave because they lose hope and don't see a future. Too many better alternatives where careers are not threatened or jeopardized and needs are taken care of (pay, schedules, training, retirement). For some, G4 schedules outweigh the negatives but most guys that I know see (or saw) it as a stepping stone or a temporary gig good enough until a solid company calls. Shame, it held such promise and most were hopeful it would have been a career airline.