Joseph-Albert Guay (23 September 1918 – 12 January 1951) was a Canadian mass murderer, who on 9 September 1949, killed 23 people aboard Canadian Pacific Air Lines Flight 108 near Sault-au-Cochon, Quebec, using a dynamite time bomb. Guay planted the bomb in a case delivered by the partner in crime, Marguerite Ruest Pitre, the very same day to clear a debt. Pitre was later identified as coming to the airport by taxi wearing a dark dress and spotted by a local journalist. Guay's wife, the intended victim, was persuaded to deliver an important command to Baie-Comeau on behalf of her husband. This way Guay would bypass a divorce, obtain life insurance money and elope with his mistress.