Sky King

During a fierce thunderstorm, Sky picks up a mayday call from a Air Force courier plane which is about to run out of gas. The Air Force request Sky's assistance in locating the downed aircraft because the pilot is transporting secret documents that are of interest to foreign governments. Sky locates the plane wreck, but the pilot is nowhere to be found. When he discovers that the navigational instruments have been tampered with, Sky fears that enemy agents may have located and stolen the secret plans and are headed for the nearby Mexican border.

When Penny discovers a wounded carrier pigeon carrying a valuable ruby attached to its leg, Sky suspects a gang of jewel smugglers is operating in the area. With the help of a Mexican police detective, Sky sets up to break up the criminal operation.

A crooked express agent fakes a hold-up to steal gold from his company's vault. He uses an old stagecoach to get the stolen loot out of town.

While helping a friend run his freight airline after an accident, Sky stumbles across a gold-smuggling operation.

Sky's efforts to prove corruption in the county clerk's office nearly result in disaster, when Sky's foreman, a non-pilot, must land the Songbird when Clipper becomes too ill to fly the plane.

Sky becomes suspicious when a Eastern woman shows up in Grover claiming to be the long-lost niece and heir of a dead rancher.

Sky attempts to help a young man recently paroled from prison get started again, but the ex-convict's former friends frame him for a bank robbery.

Sky and Penny are held captive by a maniac planning to dynamite a waterworks facility.

Sky and Penny try to clear a gentle, animal-loving "wildman" who has been blamed for the robbery of a logging company payroll.

Sky and Penny enter an air race, and it's soon discovered that the main office has been robbed and all of the receipts have been stolen. Sky suspects that one of the contestants in the race is the culprit and is using the race to make his getaway.

Sky follows the seeing-eye dog of a blind newsboy, who he believes will lead him to a holdup man living with a party of wolf hunters.

Sky is holding a wedding at the Flying Crown Ranch. The ceremony is interrupted, however, when two gangsters kidnap the groom and threaten his fiancé.

Four pilots for Wellman Air Freight Lines are injured in the first month of a contract for the company to carry s large payroll. In order to find out what's going on, Sky goes undercover as a security guard.