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Spirit Airlines is an American ultra-low-cost carrier that offers both domestic and international flights. It was founded in 1983 and is headquartered in Miramar, Florida. Spirit Airlines is known for its low fares and no-frills approach to air travel.

Here are some key points about Spirit Airlines:

1. Low-cost model: Spirit Airlines follows a low-cost carrier model, which means they offer basic air transportation at a lower price compared to traditional airlines. They charge additional fees for services like checked baggage, seat assignments, and in-flight meals, allowing passengers to choose only the services they need.

2. Route network: Spirit Airlines operates a large network of flights across the United States, as well as to destinations in the Caribbean, Mexico, Latin America, and South America. They focus on connecting major cities and popular tourist destinations.

3. Fleet: Spirit Airlines operates an all-Airbus fleet consisting of Airbus A320 and A320neo aircraft. As of my knowledge cutoff in September 2021, they had over 150 aircraft in their fleet.

4. Cabin experience: Spirit Airlines offers a single-class configuration with seating designed for efficiency and density. The seats have a no-recline feature, but passengers can purchase Big Front Seats, which offer additional legroom and other perks.

5. Fees and services: Spirit Airlines has gained attention for its à la carte pricing model. They charge fees for many additional services, including checked baggage, carry-on bags, seat assignments, printing boarding passes at the airport, and more. It's important to carefully review their fee structure before booking to avoid unexpected charges.

6. Frequent flyer program: Spirit Airlines has a frequent flyer program called "Free Spirit." Members can earn points on flights and through the use of a Spirit Airlines credit card. These points can be redeemed for flights, seat upgrades, and other benefits.

7. Customer reviews: Opinions about Spirit Airlines can vary. While some travelers appreciate the low fares and understand the trade-offs associated with the à la carte pricing, others have criticized the airline for hidden fees and the overall customer experience. It's recommended to research and consider personal preferences when choosing an airline.

It's worth noting that the information provided here is based on the knowledge available up until September 2021. For the most up-to-date and accurate information about Spirit Airlines, I recommend visiting their official website or contacting them directly.