Major Lester D. Seymour (1892-1976) was involved in both the military and commercial sides of aviation. Seymour rose to the rank of 2nd Lieutenant, Aero Engineer-Officer, 85th Aero Squadron during World War I. After the war, he became involved in the Civilian Aero Engineer US Air Service and in the Air Corps Reserve. In 1926, Seymour became involved with the commercial airlines industry. He started as the Chief Engineer at National Air Transport, and later become NAT's Vice President and General Manager. He was also briefly the Vice President of United Air Lines after their 1933 takeover of NAT. From 1933-1934 Seymour was appointed President of American Airlines.