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.
Pada 1931, induk perusahaan memindahkan operasionalnya ke Kansas, dan kemudian Jack, bersama dengan Donald Douglas, mendirikan "Northrop Corporation" di El Segundo, California, yang menghasilkan beberapa desain yang berhasil, termasuk Northrop Gamma dan Northrop Delta.