世界で初めて作られた旅客機は何社のものですか？
By 1921, aircraft capacity needed to be larger for the economics to remain favourable. The English company de Havilland, therefore built the 10-passenger DH.29 monoplane, while starting work on the design of the DH.32, an eight-seater biplane with a less powerful but more economical Rolls-Royce Eagle engine. Owing to the urgent need for more capacity, however, work on the DH.32 was stopped and the DH.34 biplane was designed, accommodating 10 passengers. The Fokker trimotor was an important and popular transport, manufactured under license in Europe and America.
de Havilland