Spirit Airlines will become the 10th airline serving Raleigh-Durham Airport in North Carolina when it launches seven routes there on May 2.

The ultralow-cost carrier will fly twice daily between Raleigh-Durham and Baltimore as well as daily to Boston, Chicago O'Hare, Detroit, Orlando, Fort Lauderdale and New Orleans.

Spirit will compete against at least two carriers on each of those routes, according to the Flight Connections website. Its biggest target will be Delta, which flies all the new Spirit routes except for Raleigh-Durham-Baltimore. Other big targets are Southwest, which flies four of the routes, and Frontier, which flies three of them.

Spirit will operate 145-seat Airbus A319s or 182-seat Airbus A320s on the routes.

Spirit's launch in Raleigh-Durham comes as traffic at the airport is growing rapidly. Airlines are scheduled to offer 15.7% more departing seats from Raleigh-Durham during the current winter travel season than they did last year -- the fourth-fastest growth rate among the 50 most trafficked U.S. airports, according to OAG data.

Frontier led the way, adding nearly 154,000 seats, tripling its Raleigh-Durham capacity. Delta, the airport's biggest operator, added nearly 91,000 departing seats this winter -- an increase of 10.4%, according to OAG.

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