Lt. Elwood "Pete" Quesada, a member of the historic "Question Mark" aerial refueling operation, adjusts an aircraft gas line. During a 1929 operation dubbed "Question Mark," a Fokker C-2A was refueled in flight by two modified Douglas C-1 transport aircraft. The operation began on New Year's Day in 1929 and ended 150 hours and 40 minutes later on Jan. 7. The two refueling aircraft passed 5,660 gallons of fuel, completing 43 sorties, 12 of which occurred at night. (Courtesy photo)
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