Southwest Airlines Co. engages in the operation and management of a passenger airline. The firm also offers ancillary services such as early bird check-in, upgraded boarding, and transportation of pets and unaccompanied minors. It operates in the United States, the Commonwealth of Puerto Rico, Mexico, Jamaica, the Bahamas, Aruba, Dominican Republic, Costa Rica, Belize, Cuba, the Cayman Islands, and Turks and Caicos. The company was founded by Rollin W. King and Herbert D. Kelleher on March 9, 1967 and is headquartered in Dallas, TX.