Southwest Airlines Co. operates a passenger airline that provides scheduled air transportation services in the United States and near-international markets. As of December 31. 2017. the company operated a total of 706 Boeing 737 aircraft; and served 100 destinations in 40 states, the District of Columbia, and the Commonwealth of Puerto Rico, as well as 10 near-international countries, including Mexico, Jamaica, the Bahamas, Aruba, the Dominican Republic, Costa Rica, Belize, Cuba, the Cayman Islands, and Turks and Caicos.