Spirit's cancellation policies can result in some interesting unintended trips. One of my cousins and his girlfriend had $9 tickets on Spirit to go from DTW to florida for a weekend. When they got to the airport there were only a few other people on the flight and Spirit cancelled it (and tried to pretend it wasn't because they'd lose a ton of money on it) and tried to tell everybody "here's your $9, go away". My cousin's GF told them they couldn't do that, and that it had been hard for her to get the time off for the trip, and that the airline had to fly them *somewhere*, so what planes in the next few hours have seats?". They got a flight to LA and came and hung out at my place for a long weekend - it was nice to have the surprise visit.