Why are Spirit tickets so cheap?

Related questions

1. Is it more expensive to book a trip through a travel agent?
2. What are spirit fees?
3. Are tickets cheaper at the airport?
4. Why do flight prices change so much?
5. Do travel agents get discounts on airfare?
6. Do plane ticket prices go down?
7. Can travel agents get better airfare?
8. Do travel agents travel for free?
9. How much is a travel agent fee?
10. Do flight prices drop at last minute?

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16. #working