The Three Aces are Fog Fortune, Gunman Bill and Whistler Will,all pilots who bonded while fighting in the Spanish Civil War (which side is not mentioned). They are now US navy reservists, travelling the world in their biplanes, seeking out adventure.
The first story sees them in Baghdad, where they learn of a number of planes that have gone missing while flying over the desert. A distraught young woman enlists them in flying over the desert in search of her father, Inspector Higgins of Scotland Yard, who had gone missing while looking into the case. They fly out, and spot a lost caravan, land, and are ambushed. Gunner manages to get back in the air, calls for the British airforce, and circles until they arrive to rescue his comrades and the inspector.
The second story is quite different. They are flying in formation with their fellow reservists, when one dies mid-flight. They discover his widow in the arms of one of their buddies, and fake them out into confessing murder.
Three Aces continues in the Early Golden Age
Three Aces: Action Comics 18 – 19 (Nov – Dec 39)