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02/28/2008. This JN-4D was built by Curtiss in 1918, served with the USAAS as a primary trainer and made its last flight before 1926. Presently it is being restored to airworthy condition at the Golden Age Air Museum. At least 5415 serials were assigned to the JN-4D and JN-4D-2 (a slightly improved version), 2259 were cancelled, the production was divided between Curtiss and six license builders: Fowler Airplane Corporation Howell & Lesser Liberty Iron Works Springfield Aircraft Corporation St. Louis Aircraft Corporation US Aircraft Corporation