Southwest Airlines is a major airline in the United States. It is headquartered in the Love Field neighborhood of Dallas, Texas. It is the fourth-largest airline in North America when measured by passengers carried, as of 2024. With its all-Boeing 737 fleet, Southwest serves over 100 destinations in 42 states, Washington, D.C., Puerto Rico, and ten other countries and territories near the southern United States in the Gulf of Mexico and Caribbean Sea regions: Aruba, the Bahamas, Belize, the Cayman Islands, Costa Rica, Cuba, the Dominican Republic, Mexico, Jamaica, and Turks and Caicos.