I did not know how bad they were a booked a flight last year... omg... worst flight ever. Swore I would never fly them again, not worth a tiny bit of extra savings
A few years ago I needed to book a flight and Spirit was much cheaper than the alternative. I figured there had to be a catch and went with the other airline.
All it takes is one very bad experience and passengers leave forever.
I got in the middle of a Air France protest shutdown and will never fly them again.