You mean this one, Eric Petras?
The art on the cover and interior was all by John Severin, who knows WWI airplanes pretty well. Unusually, instead of the usual Fokker Tripes and D.VII's, the bad Baron and his buddies of the Flying Circus were depicted flying Halberstadt D-types and Albatros D.II's! Here's the dastardly Baron himself, and Sgt. Fury's Dad, who flies a Sopwith Pup: