The use of the airplane as a device to deliver mail did not become popular until

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The use of airplanes to deliver mail did not become popular until after World War I, when technological advances and surplus military aircraft made it feasible to do so. Government grants did provide for pilot training, but that alone did not lead to widespread adoption of airplanes for mail delivery. Charles Lindbergh's famous flight occurred after airplanes were already being used for mail delivery. The fact that it was a quicker and cheaper way to deliver mail was certainly a factor, but without the technological advances and surplus aircraft from World War I, it would not have been possible. Amelia Earhart's achievements, while significant, did not have a direct impact on the use of airplanes for mail delivery.

The Use of the Airplane as a Device to Deliver