The Nieuport 24 was a French biplane fighter aircraft during World War I designed by Gustave Delage as a replacement for the successful Nieuport 17. Its performance was little better than the type it was meant to replace, which was largely superseded by the SPAD S.7 instead. Operational Nieuport 24s served with French, British and Russian units, and the type also served widely as an advanced trainer.
There were initial structural problems with the Nieuport's tail, and most production aircraft of the type were of the Nieuport 24bis model, which retained the fuselage and wings of the 24, but reverted to the Nieuport 17 type tailplane, tailskid and rectangular balanced rudder.
Source: Wikipedia, "Nieuport 24", available under the CC-BY-SA License.