Estimates are based on data from the 2007 and 2002 Commodity Flow Surveys. Because of rounding, estimates may not be additive.
|Export mode of transportation||Value (percent)||Tons (percent)||Value Standard Error of %||Tons Standard Error of %|
|Air (including truck and air)||32.1||30.3||0.8||0.7||0.7||1.3||0.1||0.2|
|Parcel, U.S.P.S. or courier||6.6||4.1||0.1||0.1||0.4||0.5||-||-|
|Other and unknown modes||4.4||2.6||3.8||2.1||0.3||0.3||0.5||0.4|
KEY: S = Estimate does not meet publication standards because of high sampling variability or poor response quality. - = Zero or Less than half the unit shown; thus, it has been rounded to zero.
1 "Truck" as a single mode
includes shipments that were made by only private truck, only for-hire truck,
or a combination of private and for-hire truck.
2 Estimates for pipeline exclude shipments of crude petroleum.
NOTES: Value-of-shipment estimates have not been adjusted for price changes. More information on sampling error, confidentiality protection, nonsampling error, sample design, and definitions may be found at http://www.bts.gov/cfs.
SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics and U.S. Department of Commerce, U.S. Census Bureau, 2007 Economic Census: Transportation Commodity Flow Survey, December 2009.