(billions)
| 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003p | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air (improved BTS)1,2 | 10.420 | 9.960 | 10.990 | 11.540 | 12.030 | 12.720 | 13.760 | 13.900 | 14.140 | 14.500 | 15.810 | 13.288 | 13.837 | 15.096 |
| Air (NTS)3 | 9.064 | 8.860 | 9.820 | 10.675 | 11.803 | 12.520 | 12.861 | 13.601 | 13.840 | 14.202 | 14.983 | 13.088 | ||
| Air (Eno)4 | 10.420 | 9.960 | 10.990 | 11.540 | 12.030 | 12.720 | 13.760 | 13.900 | 14.140 | 14.500 | 15.810 | 15.180 |
1 U.S. Department of Transportation, Bureau of Transportation Statistics, Office of Airline Information, Air Carrier Traffic Statistics Monthly (Washington, DC: 1990-2003), Freight, Express, and Mail Revenue Ton-Miles table, p. 2, line 3.
2 Federal Aviation Administration, supplementary statistics.
3 U.S. Department of Transportation, Bureau of Transportation Statistics, National Transportation Statistics (Washington, DC: 2003), table 1-44.
4 Eno Transportation Foundation, Transportation in America (Washington, DC: 2002).
Key: p = preliminary.