Air Mail Service by installing a larger 150-horsepower Hispano-Suiza engine and a mail compartment.
The JN-4D featured a 90-horsepower Curtiss OX-5 engine. The Army ordered Curtiss to convert six JN-4Ds for the U.S. Air Mail Service by installing a larger 150-horsepower Hispano-Suiza engine and a mail compartment. These airplanes were redesignated as JN-4Hs. The Smithsonian acquired this Jenny in 1918.