|Air (including truck and air)||2,927||1.4||91||Z||113||0.2|
|Parcel, U.S. Postal Service, or courier service||16,873||7.9||615||0.2||328||0.6|
|Truck and rail intermodal combination||5,267||2.5||S||S||2,127||3.7|
|Truck and water||S||S||S||S||S||S|
|Rail and water||Z||Z||Z||Z||Z||Z|
|Other multiple modes||S||S||S||S||S||S|
|Other and unknown modes||9,935||4.7||6,631||2.0||1,437||2.5|
KEY: S = data do not meet publication standards because of high sampling variability or other reasons; Z = zero or less than 1 unit of measure.
NOTE: The Commodity Flow Survey covers business establishments in mining, manufacturing, wholesale trade, and selected retail industries. The survey also covers selected auxiliary establishments (e.g., warehouses) of in-scope multiunit and retail companies. The survey excludes establishments classified as farms, forestry, fisheries, governments, construction, transportation, foreign establishments, services, and most establishments in retail. Due to industry-wide reporting problems, shipments by oil and gas extraction establishments are also excluded.
SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics and U.S. Department of Commerce, U.S. Census Bureau, 1997 Commodity Flow Survey, Washington, DC: 1999, available at http://www.bts.gov/ntda/cfs/cfs97od.html as of Nov. 2, 2001.