Table 1,,,, Domestic Air Revenue Freight Tons and Ton-Miles: 1991–2000 ,,,, Year,Enplaned revenue tons (millions),Revenue ton-miles (billions),Revenue ton-miles per capita,Miles per revenue ton 1991,4.9,8.7,34.6,"1,799" 1992,5.1,9.7,37.9,"1,912" 1993,6.4,10.5,40.9,"1,650" 1994,6.8,11.6,44.7,"1,711" 1995,7.2,12.3,47.0,"1,713" 1996,8.0,12.7,47.7,"1,572" 1997,11.1,13.4,50.2,"1,213" 1998,11.8,13.7,50.7,"1,162" 1999,12.1,14.0,51.3,"1,160" 2000,12.7,14.7,52.5,"1,161" "SOURCES: 1991–1995: U.S. Department of Transportation, Federal Aviation Administration, Airport Activity Statistics of Certificated Route Air Carriers (Washington, DC: Various years).",,,, "1996–2000: U.S. Department of Transportation, Bureau of Transportation Statistics, Airport Activity Statistics of Certificated Air Carriers (Washington, DC: Various years).",,,, ,,,, ,,,,