Figure 2,,,,,
Enplaned Air Revenue Tonnage by Type of Service: 1991–2000,,,,,
(Billions of tons),,,,,
Year,Non-scheduled,Scheduled,,,
1991,167,"4,688",,,
1992,46,"5,008",,,
1993,858,"5,526",,,
1994,"1,025","5,778",,,
1995,"1,275","5,929",,,
1996,"1,860","6,188",,,
1997,"4,312","6,774",,,
1998,"4,983","6,802",,,
1999,"4,936","7,131",,,
2000,"5,070","7,620",,,
"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).",,,,,