The Fokker Dr.I Dreidecker (triplane) was a World War I fighter aircraft built by Fokker-Flugzeugwerke. The Dr. I saw widespread service in the spring of 1918. It became renowned as the aircraft in which Manfred von Richthofen gained his last 20 victories, and in which he was killed on 21 April 1918.
Source: Wikipedia, "Fokker Dr.I", available under the CC-BY-SA License.
As Described In
Red Baron: Along with the Camel, the Dr.I is the most agile aircraft of the war. It's not as fast or sturdy however. Its climbing ability is phenomenal.