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June 14, 1910
U.S. Congress passes the Sheppard Bill, authorizing the U.S. Postmaster General to investigate the feasibility of air mail service.

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Sept. 23, 1911
Stunt Pilot Earle Ovington flies a daily "air mail" route between Mineola and Long Island, N.Y., during the week-long Nassau Aviation Meet.

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May 15, 1918
U.S. Army launches an experimental air mail service between Washington, D.C., and Philadelphia.
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Aug. 12, 1918
U.S. Army transfers responsibility for air mail delivery to the Post Office Department, which launches the first regular air mail service between College Park, Md. and Chicago.
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Sept. 8, 1920
U.S. Air Mail Service becomes a coast-to-coast operation as mail is flown during the day and moved by train at night.
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Feb. 22, 1921
U.S. Air Mail Service demonstrates the feasibility of flying the mail day and night with a dramatic cross-country flight.

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Feb. 25, 1925
U.S. Congress passes the Kelly Act, authorizing private operators to bid on air mail contracts.

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