Quite different in style and approach from Yavor's elegant posts; nonetheless, here are some more old pulp covers:
Sorry, I don't know the artist for "Battle Birds" of January 1934. Hannover CL-types were a favorite of pulp artists, I suppose because info was available on them.
One doesn't see too many Siemens Schuckerts in the pulps. Reference material must have been hard to come by! "Sky Fighters" February 1935
"Air Trails" of September 1931. Cover art by the well-known Frank Tinsley. There certainly was a variety of air-war titles available.