Boeing Airplane & Transport Corporation to encompass both manufacturing and airline operations. The next year the company was renamed United Aircraft and Transport Corporation and acquired several aircraft makers, among them Chance Vought, Avion (which became Northrop Aircraft), Stearman Aircraft, Sikorsky Aviation, engine manufacturer Pratt & Whitney, and aircraft and propeller maker Hamilton Metal plane. In 1931 it combined four smaller airlines under its ownership into United Airlines. In 1934,…
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