During the year 1912-1916 The United States has tried to send mail by air and on January 1, 1914 opening of routes across the bay in Tampa. In Florida, USA, with St. Petersburg. The first passenger (Will. 1984: 40)
, after successful trials transport mail by air in 1918, the United States has expanded the business. For more extensive permanent in 1919 has opened up the first commercial airlines in Europe. Flights between London and Paris And in 1920 was expanded to fly between France and Germany (Lundberg, 1985: 67), and at the same time expanding its US business aviation in the country. The role of the plane did not send mail only. Serves passengers and cargo, which weighs more (Wells, 1984: 42-43) In 1933, a Boeing 247 (Boeing 247) and DC (DC-1) to passengers only. 14 (Wells, 1984: 51).
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