After an emergency landing because of an in-flight fire, twenty-three passengers aboard Air Canada Flight 797 are killed when a flashover occurs as the plane's doors open. Because of this incident, numerous new safety regulations are put in place.

Air Canada Flight 797 was an international passenger flight operating from Dallas/Fort Worth International Airport to Montréal–Dorval International Airport, with an intermediate stop at Toronto International Airport. On 2 June 1983, the McDonnell Douglas DC-9 operating the service developed an in-flight fire in air around the rear lavatory that spread between the outer skin and the inner decor panels, filling the plane with toxic smoke. The spreading fire also burned through crucial electrical cables that disabled most of the instrumentation in the cockpit, forcing the plane to divert to Cincinnati/Northern Kentucky International Airport. Ninety seconds after the plane landed and the doors were opened, the heat of the fire and fresh oxygen from the open exit doors created a backdraft, and the plane's interior immediately became engulfed in flames, killing 23 passengers—half of the people on board—who were unable to evacuate the aircraft.