Notes: Data revised from previous editions—air:1990–1991, 1994, 1999–2001; light truck: 1998–1999, 2001. Air carrier data were smoothed using an exponential smoothing model, with a weight of 0.94 to reduce the year-to-year fluctuations. Air carrier fatalities resulting from the Sept. 11, 2001, terrorist attacks include only those persons onboard aircraft.
Sources: USDOT, National Highway Traffic Safety Administration, Traffic Safety Facts 2002, tables 7–10, available at http://www-nrd.nhtsa.dot.gov/pdf/nrd-30/NCSA/TSFAnn/TSF2002Final.pdf, as of Oct. 2004. Air carriers and general aviation— USDOT, Bureau of Transportation Statistics, National Transportation Statistics, tables 2-9 and 2-14, available at http://www.bts.gov.