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.

In the late 1990s, pieces of wreckage from the missing aircraft began to emerge from the glacial ice. It is now believed that the crew became confused as to their exact location while flying at high altitudes through the (then poorly understood) jet stream. Mistakenly believing they had already cleared the mountain tops, they started their descent when they were in fact still behind cloud-covered peaks. Star Dust crashed into Mount Tupungato, killing all aboard and burying itself in snow and ice.The last word in Star Dust's final Morse code transmission to Santiago airport, "STENDEC", was received by the airport control tower four minutes before its planned landing and repeated twice; it has never been satisfactorily explained.

British South American Airways (BSAA) was a state-run airline in the United Kingdom in the mid-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.

Most of BSAA's aircraft were given individual aircraft names beginning with "Star", the heavenly bodies used in long-range celestial navigation.