Southwest Airlines is a major US-based carrier that operates on a low-cost carrier business model. Headquartered in Love Field, Dallas, Texas, the airline operates over 120 destinations in the United States, Puerto Rico, Mexico, Central America, and the Caribbean. The airline is the largest and exclusive operator of the Boeing 737 family aircraft, with over 800 active examples across various variants. Southwest is one of the largest airlines in North America by domestic passengers flown.