Acting
Two men quarrel about the design of an aircraft engine and go their separate ways, each attempting to prove the other wrong by winning an aircraft race with his own version of the design. The son of one of the men, who has been serving in the Air Mail Service, goes to work for his father's rival and falls in love with the rival's daughter. The children together design an engine incorporating elements from both of the rival designs and enter it in the air race, easily winning. The children's love and accomplishments reunite their parents.
Special agent Al Langdon pursues elusive gem smuggler Michael Revere. Going undercover, Langdon joins Revere's gang, and in this capacity is obliged to rescue their beautiful hostage, Mary Lacy.
When World War I comes to an end, three pilots find themselves on hard times. They wind up in Hollywood, where they work as stunt fliers for a sadistic director.
Dick Morgan, formerly a professional crook, returns from the war as the "Ace" of his squadron.
A Swahili village is affected by disease. The nearby diamond mine is using this as an excuse not to ship diamonds back to HQ in South Africa. The mine president has sent a doctor, his beautiful daughter and her caregiver to find out what is going on and to cure the natives. They are travelling on foot. To speed things up the president sends his ace flyer up...
