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This is a list of aviation-related events from 1921: == Events == * Bessie Coleman attends flying school in France and became the first licensed African-American female pilot. * Mexicana de Aviación begins service. * The Imperial Japanese Navy acquires its first rigid and semi-rigid airships.〔Peattie, Mark R., ''Sunburst: The Rise of Japanese Naval Air Power 1909-1941'', Annapolis, Maryland: Naval Institute Press, 2001, ISBN 1-55750-432-6, p. 15.〕 * The Italian General Giulio Douhet publishes his highly influential book ''Command of the Air''. In it, he argues that the ability of aircraft to fly over armies and navies renders those forces of secondary importance; that the vastness of the sky makes defense against bombers impossible; that only offensive bombing to destroy the enemys air force can allow a country to achieve command of the air; that once it is achieved, a bombing campaign can be carried out against enemy "vital centers", including industry, transportation, government, communications, and "the will of the people;" and that success against enemy civilian morale in particular would be the key to victory. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「1921 in aviation」の詳細全文を読む スポンサード リンク
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