Trans-Canada Air Lines (TCA) Flight 831 was a flight from Montréal–Dorval International Airport to Toronto International Airport on November 29, 1963. About five minutes after takeoff in poor weather, the jet crashed about 20 miles (32 km) north of Montreal, near Ste-Thérèse-de-Blainville, Quebec, Canada, killing all 111 passengers and seven crew members. The crash was the deadliest in Canadian history at the time. It was also the deadliest crash of a DC-8 at the time, and, as of 2021, the sixth-deadliest.