When the United States entered World War I in April 1917, the Aviation Section of the U.S. Army Signal Corps had fifty-six pilots. At the war's end 18 months later, over 11,000 pilots had been through primary training in the United States and most learned to fly in a Curtiss JN series aircraft, or "Jenny". Generally considered the first mass-produced aircraft manufactured in the United States, over 6,000 JN-4 and JN-6 trainers were produced during World War 1, with over 3,000 from the main Curtiss plant in Buffalo alone.
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