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
",,,,,,,,,,,,,,
,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.",,,,,,,,,,,,,,

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