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OpenStudy (anonymous):

Which group best describes the order of events in the development of the airplane? Group A Hot-air balloon flights pioneer air travel Aviators fly gliders—heavier-than-air aircraft with no engines Development of engine-powered machines with propellers and lightweight motors First-ever flight across the English Channel Construction of the first military airplanes World's first scheduled commercial airline Group B Development of engine-powered machines with propellers and lightweight motors World's first scheduled commercial airline First-ever flight across the English Channel H

OpenStudy (anonymous):

Hot-air balloon flights pioneer air travel Aviators fly gliders—heavier-than-air aircraft with no engines Construction of the first military airplanes A. Group A B. Group B

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