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

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.