Freight Shipments within the U.S. by Mode: 2007
|Air (include truck-air)||357||5||9|
|Multiple modes & mail||1,917||568||469|
|Other and unknown||472||317||86|
This table includes domestic trade and the domestic portion of imports and exports.
Notes: Numbers may not add to totals due to rounding.
Source: U.S. Department of Transportation, Federal Highway Administration, Freight Analysis Framework, version 3.3, available at http://faf.ornl.gov/ accessed October 2012.