Sarah Kilgore worked for the Arabian American Oil Company in Saudia Arabia during the 1950s; in 1953 she took a trip around the world, becoming a charter member of Pan American's Round-the-World Clipper Club. Pan American World Airways was active in the airline industry from 1927, when it established a regular scheduled international service, to its bankruptcy in late 1991. Pan American was the first American airline to operate a permanent international air service. From its first route between Key West and Havana, Pan Am extended its routes into the rest of the Caribbean, Central America and South America. In 1936, Pan Am inaugurated passenger service in the Pacific, and began service in the Atlantic in 1939. Pan Am started around-the-world commercial air service in 1947 using Lockheed Constellation airliners. In 1949, Pan Am began scheduled service with the new Boeing Model 377 Stratocruiser, a large, luxurious, long-range, double deck airliner featuring a passenger lounge on its lower deck.