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, under new U.S. antitrust legislation (the Air Mail Act of 1934), aircraft manufacture was required split from air transport, and a newly incorporated Boeing Airplane Company became one of the three companies to emerge from the dissolution of United Aircraft and Transport. The other two were United Aircraft…
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