Hi,
Here's another "Aces" cover; as late as Winter 1937 they were still using WWI air scenes, while other air-war pulps were switching to more modern airplane scenarios. This is the hard way for a Nieuport to shoot down an Albatros!:
Here's another "Aces" cover (March 1929), which features an unusual combination of airplanes; an American (?) marked FE2b (?) and a Hannover CL.IIIa of 1918, based on the one in the hands of the 94th Aero and widely photographed: