On 2 August 1947, Star Dust, a British South American Airways (BSAA) Avro Lancastrian airliner on a flight from Buenos Aires, Argentina, to Santiago, Chile, crashed into Mount Tupungato in the Argentine Andes. An extensive search operation failed to locate the wreckage, despite covering the area of the crash site. The fate of the aircraft and its occupants remained unknown for over fifty years, giving rise to various conspiracy theories about its disappearance.

British South American Airways (BSAA) was a state-run airline of the United Kingdom in the mid-to-late 1940s responsible for services to the Caribbean and South America. Originally named British Latin American Air Lines, it was renamed before services started in 1946. BSAA operated mostly Avro aircraft: Yorks, Lancastrians and Tudors and flew to Bermuda, the West Indies, Mexico and the western coast of South America. After two high-profile aircraft disappearances it was merged into the British Overseas Airways Corporation at the end of 1949.