Since boyhood I have always liked the Fokker Triplane, but I have to agree with Little Hawk on the Albatross, even if just from an aesthetic point of view.

An interesting model, though not exactly a fighter plane, was the Dehavilland.

Wasn't it a Spad that Georges Guynemer disappeared in?

Thread creep - I tend to agree that it was probably an Australian ground gunner who brought down the Red Baron, though the Canadian pilot, Captain A. Roy Brown, got the credit for many years.