Air India Flight 182 was an Air India flight operating on the Toronto – Montreal – London – Delhi route . On 23 June 1985 , the Boeing 747-237B serving the flight ( 21473/330 , registration , '' Emperor Kanishka '' ) disintegrated in midair en route from Montreal to London , at an altitude of 31,000 feet ( 9,400 m ) over the Atlantic Ocean , as a result of the explosion from a bomb planted by Canadian Sikh terrorists . The remnants of the airliner fell into the ocean approximately 120 miles ( 190 km ) west-southwest of the southwest tip of Ireland , killing all aboard : 329 people , including 268 Canadian citizens , 27 British citizens and 24 Indian citizens . The bombing of Air India Flight 182 is the largest mass killing in Canadian history , the deadliest aviation accident in the history of Air India and was the deadliest act of aviation terrorism until the September 11 attacks in 2001
September 11 attacks
September 11 attacks
Air India Flight 182