Last contract negotiations, Frontier added pairings without adding pilots or planes in order to force "irregular ops", and used that as an excuse to cancel pilot's vacations. They signed a spirit-minus contract less than a year later. I can't imagine why anyone would spend one day longer than necessary at Frontier. It's one of only 2 companies I never even applied to when I was starting out, because I could tell from the outside how toxic that place would be.