The Curtiss JN-4 "Jenny" was a popular biplane used during and after World War I. Designed by Glenn Curtiss, it became famous for its reliability and ease of flying. With a wingspan of 43 feet, the Jenny was primarily used for training pilots, but it also served in various roles, including mail delivery and barnstorming, which involved entertaining crowds with aerial stunts. The Jenny's simple design and affordability made it accessible to many aviation enthusiasts in the 1920s. It played a crucial role in promoting aviation in the United States, helping to inspire a generation of pilots and contributing to the growth of the aviation industry.