In September Arnold became the first U.S. pilot to carry mail, flying a bundle of letters five miles (8 km) on Long Island, New York, and he is credited as the first pilot to fly over the U.S. Capitol and the first to carry a United States Congressman as a passenger.
Arnold je 6. julija 1911 Fédération Aéronautique Internationale (FAI) pilotski certifik št.