Jack Northrop founded three companies using his name. The first was the Avion Corporation in 1928, which was absorbed in 1929 by the United Aircraft and Transport Corporation as a subsidiary named “Northrop Aviation Corporation” (and later acquired by Boeing). The parent company moved its operations to Kansas in 1931, and so Jack, along with Donald Douglas, established a “Northrop Corporation” located in El Segundo, California, which produced several successful designs, including the Northrop Gamma and Northrop Delta. However, labor difficulties led to the dissolution of the corporation by Douglas in 1937, and the plant became the El Segundo Division of Douglas Aircraft.