Figure 2-15 Enplanements in Major Markets: 1975-1998
Enplanements in Major Markets: 1975-1998
Note: These data include those hubs that were classified as large hubs in either 1975 or 1998 or in both years. A large hub is a geographic area that enplanes 1 percent or more of national enplaned passengers. A hub may include more than one airport.
Source: U.S. Department of Transportation, Bureau of Transportation Statistics, Office of Airline Information, 1976; and Airport Activity Statistics of Certificated Air Carriers, Summary Tables 1999 (Washington, DC: 1999).