The Air Mail scandal of the early 1930s resulted in a rebuilt air mail system, under the Air Mail Act of 1934, in which carriers and their equipment manufacturers (e.g., of airframes and engines) could no longer be owned by the same company. The United Aircraft and Transport Corporation was broken up as a result of this new law. The corporation's airline interests went on to become United Airlines. Its manufacturing interests east of the Mississippi River—Pratt & Whitney, Chance Vought, and Sikorsky—remained together as the new United Aircraft Corporation, headquartered in Hartford with Frederick Rentschler, founder of Pratt & Whitney, as president. All manufacturing interests west of the Mississippi became part of a revived Boeing Aircraft.