|Other 2-axle, 4-tire vehiclesb||999,754||1,467,664||1,928,319||1,921,960|
a All domestic operations of U.S. carriers other than those operating under 14 CFR 121 and 14 CFR 135.
b Includes vans, pickup trucks, sport utility vehicles, and other 2-axle, 4-tire motor vehicles that are not passenger cars.
c Includes municipally owned transit and commercial, federal, and school buses.
d Includes light and heavy rail only.
e Fiscal year data.
f Includes on-demand service, ferryboat, and other unspecified means of transit.
Notes: Highway and air data are revised for 2007. Rail (except Intercity/Amtrak) and other transit data are also revised for 2007. Transit data from 2000 and after are not comparable to the data for earlier years or to the data published in previous editions of the report due to different data sources used.
Sources: Air CarrierBureau of Transportation Statistics, General AviationNational Transportation Safety Board, HighwayFederal Highway Administration, Intercity/AmtrakAssociation of American Railroads, Transit and Commuter RailAmerican Public Transportation Association as cited in U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, National Transportation Statistics, table 1-37, available at http://www.bts.gov/publications/national_transportation_statistics/ as of April 2010.