On 26 January 1950, the Douglas C-54 Skymaster serial number 42-72469 disappeared en route from Alaska to Montana, with 44 people aboard. The aircraft made its last radio contact two hours into its eight-hour flight. Despite one of the largest rescue efforts carried out by a joint effort between Canadian and US military forces, no trace of the aircraft has ever been found. It is considered one of the largest groups of American military personnel to ever go missing.