1930s or 1940s adventure books (of short stories) for boys featuring airplanes.  I remember a story that featured a crew of men attempting a record breaking non-stop (transcontinental? Transatlantic?) flight, in a 3 engine plane that could be refueled midair.  I remember a scene where one engine was shut down for in flight maintenance. 

One story featured two pilots flying an old biplane in a barnstorming content that was won because the co-pilot dumped itching powder down his partner's back.  Another featured WWII aircrew captured by Germans and they manage to escape and steal a German plane equipped with skis for the snow.  These books had belonged to my father, and were probably given to him by his uncle, who was a pilot.