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
Monument of Sivrihisar Airplane forces on 12 August 1921. The town later was recaptured on 20 September 1921 during the Battle of Sakarya. During the war, Turkish army had only five warplanes, which were old and not maintained. The military badly needed a new airplane. After the Turkish control was reestablished, the citizens of Sivrihisar decided to buy a new airplane to show their gratitude to the army and after a fund drive they collected TL 4,000. With this money, they bought a single-engine two-seat biplane bomber aircraft of type Breguet 14 B.2 from Breguet Aviation in France. The plane was named after the