The Question Mark (below) and Douglas C-1 Refueling biplane, in January 1929. In early 1929, then 2nd Lt Elwood R. “Pete” Quesada shared the piloting duties aboard an Atlantic (Fokker) C-2A trimotor monoplane for an endurance flight from the metropolitan airport in Los Angeles CA. The plane was dubbed “Question Mark” as no one knew just how long it could remain airborne while receiving periodic refueling in the air from a Douglas C-1 aircraft. The Question Mark and its crew remained aloft for five days, receiving 42 transfers of fuel, oil, water, and food, while flying over 11,000 nonstop miles. Lt. Gen. Elwood R. “Pete” Quesada was an architect of U.S. tactical air power, and was a key U.S. Army Air Forces leader during WWII in the European Theater of Operations. (Courtesy Photo)