The dark winter evening of November 29, 1963, would forever be etched in the minds of Canadians as a day of unimaginable tragedy. Trans-Canada Air Lines Flight 831, a DC-8F, prepared for its routine journey from Montreal-Dorval International Airport to Toronto International Airport. But mere minutes after takeoff, disaster struck. The aircraft plummeted to the ground in a wooded area near Ste-Thérèse, Quebec, claiming the lives of all 118 people on board. The crash, one of the deadliest in Canadian aviation history, would send shockwaves across the nation and prompt a thorough investigation into its causes.