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Crash à Washington : L’hélicoptère, « le seul engin mécanique qui a sauvé plus de vies qu’il n’en a prises »
Une collision entre avion de ligne et un hélicoptère militaire a coûté la vie à 67 personnes à Washington mercredi soir. Parmi les aéronefs, l’engin à hélices est-il plus dangereux ?
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