[Southwest Airlines](https://www.southwest.com/) is a US-based airline and the world's largest low-cost carrier. It is headquartered in Dallas, Texas. Southwest mainly serves the United States, but has various destinations (usually holiday-focused) in Mexico, Central America, and the Caribbean. ([Route Map](https://www.southwest.com/route-map/)) Southwest is not a part of one of the [[Airline Alliances|big 3 alliances]], but does have semi-partnerships with other airlines. [It appears](https://www.nerdwallet.com/article/travel/guide-to-southwest-transfers-and-partnerships) that you can only use these partnerships if you are a Rapid Rewards credit card holder. Even in this scenario, it is not recommended to book the partnered airlines through Southwest. --- https://www.southwest.com/ https://en.wikipedia.org/wiki/Southwest_Airlines #southwestAirlines #airlines