|U.S. air carrier, domestica||5,545||6,005|
|Light duty vehicleb,c||2,569,980||2,646,641|
aMeasured in revenue aircraft miles. bData for 2001 and 2011 may not be comparable due to changes in methodology. cIncludes passenger cars, light trucks, vans, and sport utility vehicles. dMeasured in car miles.
Source: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, National Transportation Statistics, table 1-35, available at www.bts.gov as of October 2013.