Photograph of airmail plane at Chicago
Airmail employees at a Chicago airmail field unloading mail from a recently arrived de Havilland mail airplane. A Post Office Department driver poses with the truck he will use to bring the mail to the Chicago post office. By the summer of 1924, airmail was being flown across the country in just over 30 hours, a dramatic improvement over the two to three days mail traveled by train.
National Postal Museum, Benjamin Lipsner Collection