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Air transportation in the United States
The United States has an extensive air transportation network. In 2013 there were 86 airports in the U.S. that annually handled over 1,000,000 passengers〔(CY 2013 Primary Airports -- Preliminary Data )〕 and twelve of the world's thirty busiest airports by passenger volume in 2014 were in the U.S. (down from 17 in 2004), including the world's busiest, Hartsfield-Jackson Atlanta International Airport. In 2012 88% of all traffic was through the 62 busiest airports in the country.〔U.S. House of Representatives Report, 2014, http://transportation.house.gov/uploadedfiles/2014-06-18-dillingham.pdf〕 In terms of cargo, in 2004, twelve of the world's thirty busiest airports were in the U.S., including the world's busiest, Hartsfield–Jackson Atlanta International Airport. Private aircraft are also used for medical emergencies, government agencies, large businesses, and individuals, see general aviation.
Due to the geography of the United States and the generally large distances between major cities, air transportation is the preferred method of travel for trips over , such as for business travelers and long distance vacation travelers. For cities closer together in the Northeastern part of the country (e.g. Boston, New York City, Philadelphia and Washington D.C.) the Northeast Corridor rail line carries the majority of intercity traffic.
Since the start of the Great Recession air traffic in the U.S. has declined and the U.S. government reported 1.2 million fewer scheduled domestic flights in 2013 than in 2007 (with decreases averaging between 9 and 24% at large and medium sized airports, respectively).〔 At the same time the airline industry has also experienced rapid consolidation with all of nation's largest carriers experiencing mergers.〔 The average domestic airline fare has steadily increased since 2009 and in 2014 it was higher than at any point since 2003.〔U.S. Department of Transportation, http://www.rita.dot.gov/bts/airfares/programs/economics_and_finance/air_travel_price_index/html/AnnualFares.html〕
==History==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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