The Air Mail Act of 1934 prohibited airlines and manufacturers from being under the same corporate umbrella, so the company split into three smaller companies – Boeing Airplane Company, United Airlines, and United Aircraft Corporation, the precursor to United Technologies.
Air Mail Act tahun 1934 melarang maskapai dan produsen berada di bawah payung perusahaan yang sama, sehingga perusahaan dibagi menjadi tiga perusahaan yang lebih kecil – Boeing Airplane Company, United Airlines, dan United Aircraft Corporation, pendahulu United Technologies.