On 26 January 1950, the Douglas C-54 Skymaster serial number 42-72469 disappeared en route from Alaska to Montana, with 44 people aboard.

In addition to its eight-man crew, it was carrying 36 passengers, including two civilians: a woman and her infant son.

[3] The search was aided by the fact that soldiers and equipment had already been ferried north for the upcoming Exercise Sweetbriar, a joint Canada–U.S.

[5] The operation confounded searchers, giving many false positive reports of smoke signals and garbled radio communications.

[16] In 2022, after the documentary's release, a group in Whitehorse, consisting of a geologist, a historian and a glaciologist, among others, formed to conduct a renewed search for the missing aircraft, using drones to explore inaccessible locations.