Check out landmark moments in U.S. Postal Service history.
1918: Scheduled airmail service begins. The first efforts to deliver mail by air in the U.S. dated back to 1859, when a pilot tried unsuccessfully to carry mail via air balloon from Indiana to New York.
Wil-Helm Agency via Wikimedia Commons
iStock / MartiSaiz
Courtesy of BaconBros.com
iStock / digitalskillet
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