The Curtiss JN-4 « Jenny » was one of a series of « JN » biplanes built by the Curtiss Aeroplane Company of Piston-Engined Fighters of the Argentine Air Force 1919-1955 PDF, New York, later the Curtiss Aeroplane and Motor Company. Curtiss combined the best features of the model J and model N trainers, built for the Army and Navy, and began producing the JN or « Jenny » series of aircraft in 1915. The JN-2 was an equal-span biplane with ailerons controlled by a shoulder yoke in the aft cockpit.
It was deficient in performance, particularly climbing, because of excessive weight. The improved JN-3 incorporated unequal spans with ailerons only on the upper wings, controlled by a wheel. The 1st Aero Squadron of the Aviation Section, U. Signal Corps received eight JN-2s at San Diego in July 1915. After the successful deployment of the JN-3, Curtiss produced a development, known as the JN-4, with orders from both the US Army and an order in December 1916 from the Royal Flying Corps for a training aircraft to be based in Canada. As many as 12 JN-4 aircraft were fitted with an aftermarket Sikorsky wing by the then fledgling company in the late 1920s. The Curtiss JN-4 is possibly North America’s most famous World War I aircraft.