Southwest Airlines Co. is a major airline in the United States that operates on a low-cost carrier model. It is headquartered in Love Field, Dallas, Texas, within the Dallas–Fort Worth metroplex, and has scheduled service to 121 destinations in the United States and 10 additional countries. As of 2018[update], Southwest carried more domestic passengers than any other United States airline. It is currently the third largest airline in North America based on passengers flown.
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