An airplane lands on a runway as two officers watch. An auto-gyro then lands, as a pilot opens the cockpit. Another man loads a sack of mail inside a hatch, and the auto-gyro takes off over the city of Philadelphia, among the clouds in the sky. The aircraft lands on the roof of Philadelphia’s central post office and its propellor stops. Another delivery is carried to the auto-gyro by a cart and more overhead shots of the city are seen as the aircraft flies.

Not Explicit