What happens if you don't buy seats on Spirit?

Related questions

1. What does Travelocity cancellation plan cover?
2. Why are taxes and fees so high on flights?
3. Is it cheaper to book Spirit Airlines at the airport?
4. What is a 9/11 security fee?
5. Will flights get cheaper if I wait?
6. Are tickets cheaper at airport?
7. Are plane tickets cheaper on Tuesdays?
8. Do flight prices go down closer to the date?
9. What is the Spirit $9 Fare Club?
10. Do flight prices include tax?

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