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 | | At first aviation development was motivated by the large prizes put up by publicity-seeking newspapers; but the outbreak of World War I in 1914 provided far greater motivation for aviation research and development (see air forces. |
 | | The cessation of hostilities made available a large number of aircraft that could be bought cheaply, and the result was a great deal of aviation activity; barnstorming and stunt-flying kept aviation before the eyes of the public for a time, but the real stimulus was the initiation of airmail service in the mid-1920s. |
 | | General Aviation is a term comprising all of aviation other than military and scheduled air transport (airlines), and includes privately owned aircraft, charter services, business owned aircraft, such as "bizjets," and many more types of working aircraft that are not, strictly speaking, for transportation. |
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