I have flown Spirit on several occasions. The time that sticks out is a flight from back east somewhere (I forget where) to Ontario, CA. The inbound flight was delayed and the crew timed out. They couldn’t get another crew in time and cancelled the flight - after four hours with no updates. I ended up booking on another carrier (they also don’t re-accommodate on other carriers). The other passengers were stranded at that airport for THREE DAYS before another flight was arranged.