BTS | TABLE 3-7 Change in Travel Time Variability Index and Actual Travel Time and Operated Flights: 1990-2002

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BTS Home > Publications > Transportation Statistics Annual Report > 2004 > Appendix B

TABLE 3-7 Change in Travel Time Variability Index and Actual Travel Time and Operated Flights: 1990-2002

Seasonally adjusted, yearly averages

Index: 1990 = 100.0

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	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001	2002
Actual travel time	100.0	98.8	98.2	98.5	98.4	99.4	101.3	100.3	101.3	102.3	105.0	101.8	99.4
Operated flights	100.0	84.6	86.6	89.0	90.3	94.6	95.5	100.3	99.2	99.3	101.1	96.7	88.0
Travel Time Variability	100.0	93.5	87.5	93.2	94.9	107.4	124.2	116.9	127.1	134.2	148.7	129.3	115.4

NOTE: The Travel Time Variability Index is based on the standard deviation of actual travel time.

SOURCES: Data for actual travel time-U.S. Department of Transportation (USDOT), Bureau of Transportation Statistics (BTS), calculations based on Airline Service Quality Performance data, March 2004. Operated flights-USDOT, BTS, Airline Market and Segment (T-100) data, March 2004.