The Curtiss JN-4D Jenny was a biplane designed by the Curtiss Aircraft Company during World War I. The first JN series plane was introduced in 1915 and served as a training aircraft for military pilots. The JN-4D, a more advanced version released in 1917, was known for its simpler design making it easier for new pilots to learn how to fly. The “Jenny” in its name comes from its official designation (“JN”). Many JN-4D planes were sold to civilians after the war ended. They became popular for entertainment purposes, such as barnstorming (flying stunt shows) and taking people on rides, which increased the public’s interest in aviation.

In 1998, the Curtiss JN-4D Jenny appeared upside down on many U.S. postage stamps printed to commemorate the 75th anniversary of its first flight. Though this mistake was corrected later, the upside-down Jenny stamp has become a collector’s item. Historically, the plane’s popularity helped make flight more accessible to the public, and the JN-4D Jenny is still remembered today as an icon of the early days of flight.