Inaugurated in the early 20th Century, airmail was a premium service which required paying special postal rates. U.S. airmail stamps document the early history of aviation commerce - from biplanes to Zeppelins to flying boats.

The first airmail stamp - a 24-cent stamp that covered postage from New York to Washington - was issued in May 1918. The stamp pictured the plane that carried the mail – the Curtiss Jenny – and is widely recognized today because a pane of 100 was accidentally printed with the plane upside-down.

On July 1, 1924, regular airmail service across the country was established. Airmail was divided into three zones: New York to Chicago, Chicago to Cheyenne, and Cheyenne to San Francisco. Mailing a letter cost eight cents per zone, so stamps were made in denominations of 8, 16, and 24.

In February of 1926, the Post Office contracted private air companies to distribute airmail. Three stamps were issued for use on these contract airmail routes (or CAMs), each depicting the U.S. map.

Charles Lindbergh’s historical flight in May of 1927 inspired one of the most popular airmail stamps issued, which featured his plane, the Spirit of St. Louis. The cost of airmail was reduced in 1928, and two new stamps were issued: Beacon on Rocky Mountains and the Winged Globe.

Airmail service across the Pacific was taken over by the Post Office Department in November 1935 as the threat of war with Japan increased, and Pan Am was chosen as the carrier. A stamp was issued for the three trans-Pacific zones: San Francisco to Hawaii, Hawaii to Guam, and Guam to the Philippine Islands. It originally cost 25 cents per zone, but in 1937, a 20 cent stamp was issued and the cost of mailing a letter from the mainland U.S. to the Philippine Islands was reduced to 50 cents and airmail was extended to Hong Kong.

Cross-Atlantic airmail began on May 20, 1939 as Pan Am delivered mail from New York to Marseilles, France, traveling through Portugal on the way. Although this service didn't las...

During World War II, seven stamps known as Transports were issued, each with a different denomination and depicting a different twin-motored transport plane.

After World War II, many commemorative stamps were released, such as a stamp to honor the 75th anniversary of the Universal Postal Union in 1949 and another to honor the 50th anniversary of airmail service in 1968. Many commemoratives featuring aviators (such as Amelia Earhart, Robert Goddard, and the Wright brothers) were also released.

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