providing training for pilots and providing aircraft. The first major order was for 144 various subtypes of the Model F trainer flying boat. In 1914, Curtiss had lured B. Douglas Thomas from Sopwith to design the Model J trainer, which led to the JN-4 two-seat biplane trainer (known affectionately as the "Jenny"). The Curtiss Aeroplane and Motor Company worked with the United States' British and Canadian allies, resulting in JN-4 (Can) trainers (nicknamed the "Canuck") being built in Canada. In order to complete large military orders, JN-4 production was distributed to five other manufacturers. After the war, large numbers of JN-4s were sold as surplus, making influential as the first plane for many interwar pilots, including Amelia Earhart. A stamp was printed to commemorate the Curtiss JN-4, however a printing error resulted in some having the aircraft image inverted, which has become very valuable, and one of the best known rare stamps, even being featured in a number of movies. The Curtiss HS-2L flying boat was used extensively in the war for anti-submarine patrols and was operated from bases in Nova Scotia, France, and Portugal. The John Cyril Porte of the Royal Navy and Curtiss worked together to improve the design of the Curtiss flying boats resulting in the Curtiss F5L and the similar Felixstowe F.3. Curtiss also worked with the United States Navy to develop the NC-4, which became the first aircraft to fly across the Atlantic Ocean in 1919, making several stops en route. By the end of World War I, the Curtiss Aeroplane and Motor Company would claim to be the largest aircraft manufacturer in the world, employing 18,000 in Buffalo and 3,000 in Hammondsport, New York. Curtiss produced 10,000 aircraft during that war, and more than 100 in a single week. Peace brought cancellation of wartime contracts. In September 1920, the Curtiss Aeroplane and Motor Company underwent a financial reorganization and Glenn Curtiss cashed out his stock in the company for $32 million and retired to Florida. He continued as a director of the company but served only as an advisor on design. Clement M. Keys gained control of the company from Willys-Overland and it later became the nucleus of a large group of aviation companies. Curtiss seaplanes won the Schneider Cup in two consecutive races, those of 1923 and 1925. The 1923 race was won by U.S. Navy Lieutenant David Rittenhouse flying a Curtiss R3C