In the November 1936 issue of Flying Aces, Donald E. Keyhoe introduced Richard Knight, ace pilot and secret agent of the U.S. government. Along with his dame-chasing assistant Larry Doyle, he confronts evil-doers around  the world, flying his specially equipped (and heavily armed) blue Northrup.

Down upon the flood-lit Washington Airport came a sleek Douglas transport. And from it ran a strangely costumed girl wielding a glittering dagger in spirited attempts to protect herself from the burly men who sought to stop her. Only the lightning decision of a tall, well-built man in a car on the driveway saved her. That man was Richard Knight. And this surprising incident was destined to send him upon the most startling adventure of his career—an adventure which, wholly unknown to him, had begun more than half a century before he was born.

• Download “Vultures of the Lost Valley” (November 1936, Flying Aces)

Here is another high flying adventure of “Cyclone” Bill Garrity and The Devildog Squadron. For months the grim spectre of that German staffel had stalked up and down the Front, dropping its sinister messages of death upon British and French squadrons. And now at last it struck at the flying Marines. For out of the cloud mists over that Devildog drome a white-winged German plane swooped low, and from it came the threat of doom—a black coffin holding the body of a Devildog pilot.

• Download “The Squadron in Scarlet” (November 1931, Sky Birds)

Once again the Devildog Squadron is roaring into action!

Under guard in his hut—on a double charge of treason and murder! He had led two men out on a secret mission and they had not returned—but he had brought straight to his hidden drome a flock of Boche. And that night he was found beside the body of the man who had called him a spy—and the man was dead, shot through the heart! Yet for Larry Brent, one of those twenty loyal hellions the Boche had named Devildogs, there was always a way out—even though it led to the Squadron Without a Name.

• Download “The Squadron Without a Name” (September 1931, Sky Birds)

Here they are again—that bunch of flying, fighting Devildogs—Lucky Lane and the Three Lunatics, Cyclone Bill Garrity, and the rest of the mad Marines. And fighting against them is a silent, unseen menace—a strange, black shadow that shrouds whole formations in its sable cloak of death, and sends them reeling down—to doom.

• Download “Devildog Breed” (July 1934, Sky Birds)

Four squadrons had been wiped out by the unknown menace that struck from above, and in the smoldering ruins of those Allied dromes not a man was left alive. Now in the air before Cyclone Bill Garrity’s eyes four Spads had vanished, and only smoke and fiery fragments showed where the fearful man-made lightning had taken its toll. The drome of the 81st lay directly in the path of this weird, flashing doom from the skies—and the Devildogs would be next!

• Download “Devildog Doom” (June 1932, Flying Aces)

Gil Tracy and Porky Baines, test pilots for Transatlantic Airways, are caught right in the middle when pirates set their sights on the company’s trans-ocean planes. The two adventurers must fight their way from New York to the mythical Sargasso Sea.

• Download “Isle of Lost Ships” (August 1930, Flying Aces)

And now an exciting tale of The Devildog Squadron!
Lucky Lane swore as he realized he had lost his formation in the billowing gray clouds. He leveled off between two layers of leaden mist and peered about him. The other three of the “Four Lunatics” had been behind his Spad not thirty seconds past. But now he was alone. Not only that, but his gas was running low and he was not even sure of his location.
The bullet-scarred Spad ripped on through the cloud. Lucky eased back on the stick as he saw the mists begin to thin. He was down to three thousand feet—and there was a good chance that he was still over German soil…

• Download “Lucky’s Day” (August 1932, Sky Birds)