Canadian Pacific Air Lines Flight 21 was a domestic scheduled flight from Vancouver, British Columbia, Canada, to Whitehorse, Yukon, Canada via Prince George, Fort St. John, Fort Nelson and Watson Lake on Thursday, July 8, 1965. The Douglas DC-6B plane crashed near 100 Mile House, British Columbia, taking the lives of all 52 aboard.[2] An inquest determined that the explosion was the result of a bomb, but the source of the bomb was never determined.[1]