Hi,
Here's some more covers:
Of course, "No Parachute" isn't fiction, but since Pete already posted some non-fiction covers I guess it's OK. The cover is sort of fiction, though, since it has an unfortunate Sopwith Pup being shot down by a Fokker D.VII - in some sort of time warp! The cover is by Ed Valigursky, a very prolific paperback cover artist, best known for his science fiction stuff. The cover of "Falcons of France" may also be by Valigursky - I can't be sure. It features the almost-requisite red Fokker Tripes, but at least has a SPAD XIII in French markings - appropriate to the book.