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Map
Enplanements at Large Air Traffic Hubs: 1975 and 1999
NOTE:
These data include hubs that were classified as large hubs in either 1975 or 1999 or in both years. A large hub is a geographic area that enplanes
1 percent or more of nationally enplaned passengers. A hub may include more than one airport.
SOURCES:
Civil Aeronautics Board, Airport Activity Statistics: Twelve Months Ending December 31, 1975 (Washington, DC: 1976); U.S. Department of
Transportation, Bureau of Transportation Statistics, Office of Airline Information, Airport Activity Statistics of Certificated Air Carriers, Summary
Tables, Twelve Months Ending December 31, 1999 (Washington, DC: 2001).
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