Try refreshing your browser, or Mystery of U.S. aircraft âmissingâ during flight over Canada continues to raise questions Back to video More than 71 years ago, on January 26, 1950, US Air Force Douglas C-54D Skymaster Serial 42-72469 went missing on a flight between Anchorage/Elmendorf, Alaska and Great Falls, Montana. Two hours into the flight while crossing the Yukon-British Columbia border, the last contact with the plane was in a radio position report received at 1:14 p.m. This report stated that the aircraft had passed over Snag, Yukon Territory, and five minutes later was expected to be over Aisihik This would be the last message after which nothing more was heard from the military transport. The four-engine aircraft, carrying 41 military personnel and three civilians, including an expectant woman and her infant son, had simply disappeared without a trace.