|Number ($ millions)||Percent||Number (thousands)||Percent||Number (millions)||Percent|
|Air (including truck and air)||S||S||3||Z||4||Z|
|Parcel, U.S. Postal Service, or courier service||900||2.5||28||Z||18||Z|
|Truck and rail intermodal combination||283||0.8||221||Z||590||0.8|
|Truck and water||S||S||S||S||690||1.0|
|Rail and water||125||0.4||5,013||2.1||2,963||4.2|
|Other multiple modes||26||Z||1,019||0.4||1,787||2.5|
|Other and unknown modes||779||2.2||11,330||4.8||1,712||2.4|
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.