Spirit Airlines expands routes at Detroit Metro after emerging from bankruptcy

1. Orlando International Airport (MCO): With 90 monthly round trips, this route is served by Airbus A319 or A321 aircraft. "Southwest Airlines dominates the traffic in and out of MCO," but Spirit holds the second-largest market share.

2. Hartsfield-Jackson Atlanta International Airport (ATL): Spirit operates 83 monthly round trips on this route using Airbus jets. ATL is known as the world's busiest airport, serving over 100 million passengers annually.

3. Fort Lauderdale-Hollywood International Airport (FLL): With 81 monthly round trips, Spirit offers direct flights using Airbus A319 and A320 aircraft. FLL serves over 36 million passengers each year.

4. Harry Reid International Airport (LAS): This route sees 60 monthly round trips with flights typically lasting between three and four hours aboard Airbus A320neo or A321 aircraft.

5. New York LaGuardia Airport (LGA): With 56 monthly round trips, this route features flights on an Airbus A321neo and operates from Terminal A at LGA.

Spirit Airlines' CEO Ted Christie leads the ultra-low-cost carrier that was founded in 1983. The airline's loyalty program is called Free Spirit.