From its Texas beginnings 43 years ago, Southwest Airlines has grown to be the largest domestic carrier in the United States. But it has never flown to an airport outside the U.S.

On Tuesday, that changes.

The Dallas-based carrier will launch flights to the Bahamas, Aruba and Jamaica on Tuesday. It adds flights to Cancun and Los Cabos, Mexico, on Aug. 10, and Mexico City and Punta Cana, Dominican Republic, on Nov. 2.

"It's huge," Southwest executive Teresa Laraba said last week about Tuesday's move into international markets. "Obviously we've been waiting for 43 years to get to this point. It's a pretty big deal. It's such an opportunity for us to plant our name and flag in international waters, and we've never done it. We are pretty excited around this place."

Right now, those cities are served by AirTran Airways, a carrier acquired by Southwest in May 2011. Southwest has been absorbing the smaller carrier over time but had not assumed any of AirTran's international markets.

As Southwest enters the seven international cities in the next four months, AirTran will pull out. On Dec. 28, AirTran will operate its last flight, from Atlanta to Tampa, Fla., as it finishes its integration into Southwest.

Compared with major competitors that have more than 40 percent of their capacity on international routes, Southwest will be a very small player. Southwest CEO Gary Kelly estimates that international flying represents only about 1 percent of AirTran and Southwest capacity in 2014.


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While the carrier would like to grow its international system, "I think it's going to continue to be a relatively modest component of the Southwest route system for the near future, for over the next several years," Kelly told analysts and reporters in April.

Southwest has halted its growth while it works to improve its return on invested capital. That means new flights in one area will result in fewer flights elsewhere.

Even so, Kelly recently called the international launch "our top priority for this year."

"Our focus is near-international," he told shareholders at Southwest's annual meeting May 14. "So Canada, the Caribbean, Mexico, Central America and even as far as the northern part of South America are all wonderful international opportunities that we're excited about. We have more opportunities than we have airplanes over the next four or five years, and that's a good thing."

Company officials have said they can readily identify 50 new cities that the carrier could reach. With North America largely saturated, the bulk of those destinations are international.

"I wouldn't be surprised if it's a couple hundred aircraft worth of growth just with the capabilities that we have today," Southwest Chief Financial Officer Tammy Romo said at a June 5 investment conference.

Initially, Southwest will launch service to Aruba and Jamaica from Atlanta, Baltimore and Orlando, Fla., and to Nassau from Baltimore. In August, Milwaukee and Orange County, will get international service, and San Antonio, Austin and Chicago will be added to the network in November.

The Texas routes include San Antonio-Mexico and Austin-Cancun flights. Although the prohibition on nonstop U.S. flights out of Love Field expires Oct. 13, federal law still bans nonstop service from Love to outside the U.S.

For passengers familiar with Southwest service, the international flights will not differ much from its domestic service, although passengers (and crews) must deal with issues of customs and immigration.

While some of the new flights will be lengthy, Southwest already operates flights longer than the longest international flight, nearly 2,000 miles from Chicago Midway Airport to Punta Cana. Its three flights from Baltimore to the cities on the West Coast -- Seattle, Portland and Los Angeles -- are each more than 2,300 miles.