Evelyn Vail (Florence Rice) is a nurse convicted of poisoning a patient. Out on parole, Evelyn decides to fly to Sing-Sing and confront death row inmate who accused her of the deed in the first place. On board the airliner, Evelyn makes the acquaintance of John Robinson Gordon (Nagel), who is transporting a revolutionary munitions formula to Washington, D.C. Another passenger, Baker (Robert Allen), complains of having been poisoned and leaves the plane during a stopover in Dallas. Back in the air, Gordon's bodyguard, Lieutenant O'Brien (Fred Kelsey), suffers the same fate, but this time the poison proves fatal. The plane returns to Dallas, where Police Captain Barrie (William B. Davidson) accused poor Evelyn of the crime. Happily, Gordon can prove otherwise and the real culprit is unmasked.

Nora Clegg, an actress, marries Carl Brent, an unemployed young engineer, whose estimation of his worth and ability keeps him from getting a job. He finally acquires a position that will require him to go to Russia for a period of time, while Nora goes back to the stage during his absence. But he loses out on the job at the last minute, and rather than tell Nora he has failed again, he steals a roll of money from his prospective employer to buy some things for Nora and go out and have a good time before, she things, his departure. His departure is to jail rather than Russia and he hides the truth from Nora by having an acquaintance mail his letters from Russia. He then finds out that Nora is pregnant.

Entertainers lose their jobs and their fares from Honolulu back to San Francisco so they must become stowaways.

A man who loves an aspiring opera singer is prepared to sacrifice everything to help her with her career, even though he knows she doesn't love him.

A small, independent air delivery service is menaced by a mad scientist with a death ray machine that blows up planes in mid-flight.