The Curtiss JN-4, commonly known as the "Jenny," was a biplane designed by the Curtiss Aeroplane Company during World War I. It was primarily used for training pilots and became one of the most popular aircraft of its time. The Jenny featured a distinctive two-wing design and was powered by a OX-5 V-8 engine, allowing it to reach speeds of around 75 miles per hour. Introduced in 1917, the JN-4 played a significant role in the post-war aviation boom, often used for barnstorming and mail delivery. Its simple design and reliability made it accessible for many aspiring aviators, contributing to the growth of civilian aviation in the United States.