Question: What's the NASDAQ ticker code for Spirit Airlines, based at Detroit Metro Airport among others and an ultra low cost carrier?

Passages:
Swoop is a Canadian ultra low cost carrier owned by WestJet.  It was officially announced on September 27, 2017, and will tentatively begin flying in June 2018.  The airline will be based in Calgary, Alberta.  It was named after WestJet's desire to "swoop" into the Canadian market with a new business model. <P1-S0> The ExpressTram is an automated people mover system operating at Detroit Metropolitan Wayne County Airport, in Romulus, Michigan, USA. <P1-S1>  The driverless system transports passengers along Concourse A of the airport's Edward H. McNamara Terminal, which is the world's second-longest airport concourse. <P1-S2>  Detroit Metro Airport serves as the second largest hub for Delta Air Lines, after Atlanta. <P1-S3>  The ExpressTram entered service when the McNamara Terminal opened on February 24, 2002. VivaColombia is a Colombian low-cost airline based in Medellín, Colombia.  VivaColombia is the first true low cost carrier in Colombia.  It is partly owned by the founders of Europe's biggest low cost airline, Ryanair. <P3-S0> Philadelphia International Airport (IATA: PHL, ICAO: KPHL, FAA LID: PHL) , often referred to just by its IATA code PHL, is a major airport in Philadelphia, Pennsylvania, United States, and is the largest airport in the Delaware Valley region and in the state. <P3-S1>  The airport is a major international hub for American Airlines and a regional cargo hub for UPS Airlines. <P3-S2>  Philadelphia International Airport is also a focus city for ultra low cost airline Frontier Airlines. <P3-S3>  The airport has service to destinations in the United States, Canada, the Caribbean, Latin America, Europe, and the Middle East. <P3-S4>  Most of the airport property is located in Philadelphia proper. <P3-S5>  The international terminal and the western end of the airfield are located in Tinicum Township, Delaware County. <P3-S6>  PHL covers 2,302 acres (932 ha). Low cost carrier terminal or LCCT a.k.a. budget terminal is a specific type of airport terminal designed with the needs of low cost airlines in mind.  Though terminals may have differing charges and costs, as is common in Europe, the concept of an all budget terminal was promoted and pioneered by Tony Fernandes of AirAsia at Kuala Lumpur International Airport in 2006. Frontier Airlines is an American ultra low cost carrier headquartered in Denver, Colorado.  The carrier, which is a subsidiary and operating brand of Indigo Partners, LLC, operates flights to 54 destinations throughout the United States and 5 international destinations.  The airline maintains a hub at Denver International Airport with numerous focus cities across the United States.  Also, under a codeshare agreement with Great Lakes Airlines, the airline connects passengers to surrounding Rocky Mountain States through their Denver hub. Pinnacle Race Course is a failed attempt to start a new thoroughbred horse racing track in Huron Township, Michigan, southwest of Detroit off of Interstate 275.  The track was just south of the Detroit Metro Airport, in Wayne County.  The track was built on land owned by Wayne County, and the county lost $36 million when it failed. Air One S.p.A., was an Italian airline which operated as Air One "Smart Carrier".  It operated as Alitalia's low cost carrier subsidiary with operating bases located in Catania-Fontanarossa Airport, Palermo Falcone–Borsellino Airport, Pisa Airport, Venice Marco Polo Airport and Verona Villafranca Airport; while Tirana was a focus city.  "Air One" is a portmanteau of the English meaning Air One and the Italian word 'airone', meaning heron (the bird depicted in the airline's logo), which was also the airline's callsign. Spirit Airlines, Inc. (NASDAQ: SAVE ) is an American Ultra Low Cost Carrier, headquartered in Miramar, Florida.  Spirit operates scheduled flights throughout the United States and in the Caribbean, Mexico, Latin America, and South America.  The airline operates bases at Atlantic City, Chicago–O'Hare, Dallas/Fort Worth, Detroit, Fort Lauderdale and Las Vegas as of 2015 . Detroit Metropolitan Wayne County Airport (IATA: DTW, ICAO: KDTW, FAA LID: DTW) , usually called Detroit Metro Airport, Metro Airport, or just DTW, is a major international airport in the United States covering 4,850 acre in Romulus, Michigan, a suburb of Detroit.  It is Michigan's busiest airport, and one of the largest airline hubs in the country.  The Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2017–2021 categorized it as a large hub primary commercial service facility.

Supporting sentences:
 The airline operates bases at Atlantic City, Chicago–O'Hare, Dallas/Fort Worth, Detroit, Fort Lauderdale and Las Vegas as of 2015 . Detroit Metropolitan Wayne County Airport (IATA: DTW, ICAO: KDTW, FAA LID: DTW) , usually called Detroit Metro Airport, Metro Airport, or just DTW, is a major international airport in the United States covering 4,850 acre in Romulus, Michigan, a suburb of Detroit.