Southwest Airlines will begin international service on July 1 with flights to Aruba; Montego Bay, Jamaica; and Nassau, Bahamas.
The service is a transfer of existing AirTran routes to the Southwest brand.
From Atlanta, Southwest will fly daily to Montego Bay and Aruba. From Baltimore/Washington, the airline will fly daily to Aruba and Nassau, and twice daily to Montego Bay.
From Orlando, Southwest will fly to Aruba on Saturdays and to Montego Bay daily.
AirTran will continue Atlanta-Nassau and Chicago Midway-Montego Bay service, as well as its flights to Cancun, Los Cabos, Mexico City and Punta Cana, Dominican Republic. By the end of 2014, Southwest plans to take over those routes.
Last year, Southwest launched its first routes beyond the continental U.S. when it took over AirTran's flights to Puerto Rico from Orlando and Tampa.
Correction: A previous version of this report did not include all the routes that Southwest is taking over.