Question Mark (aircraft) Question Mark (aircraft) Question Mark (""?"") was a modified Atlantic-Fokker C-2A transport airplane of the United States Army Air Corps. In 1929, commanded by Major Carl A. Spaatz, it was flown for a flight endurance record as part of an experiment with aerial refueling. "Question Mark" established new world records in aviation for sustained flight (heavier-than-air), refueled flight, sustained flight (lighter-than-air), and distance between January 1 and January 7, 1929, in a non-stop flight of more than 150 hours near Los Angeles, California. Following the record-setting demonstration, the C-2A was returned to transport duties. In 1931 more powerful engines replaced
U.S. Army airships Amongst the most interesting U.S. Army Airship Service experiments was to pursue the ability to operate airplanes from airships. While both the Germans and British had experimented with releasing fighters from rigid airships, it was the US Army which first flew an airplane from the ground and 'hooked' on to a trapeze suspended from an airship. Many tests involving a Sperry Messenger airplane and TC-3, a TC class blimp, were made in the mid-1920s. Eventually the technology was assumed by the US Navy on the "flying aircraft carriers", USS Akron (ZRS-4) and USS Macon (ZRS-5). The US Army continued to