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The U.S. Post Office established an air mail service in 1919 and played an important role in developing air travel by setting up a nationwide system of airports. In 1925 the U.S. government began paying generous subsidies to private carriers to deliver the mail, and some companies began hauling passengers as well. Many well-known U.S. carriers were established during this period, including Pan Am (founded in 1928; now defunct), United Airlines (created in 1931 by a merger between several older mail carrying operations), American Airlines (created in 1930 out of several mail carriers), TWA (1928; now merged with American), and Delta (1929).
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