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The Bréguet Leviathan was a family of large all-metal biplane aircraft built in France in the early 1920s. The Bréguet XX and XXI were notable for being powered by Bréguet-Bugatti multiple engines, in two forms. The Bréguet XXI was powered by individual Bréguet-Bugatti U.16 engines initially and Lorraine-Dietrich 8b engines in tandem later. The Bréguet XXII had accommodation for about twenty passengers and was destroyed during a 1923 transport aircraft competition. Development of all three aircraft types was halted largely due to technical issues with power-plants and aircraft structure.
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