NOTES: See table C-17 on page 134 for the data. All data-Trade levels reflect the mode of transportation as a shipment enters or exits a border port. Flows through individual ports are based on reported data collected from U.S. trade documents. Trade does not include low-value shipments (in general, these are imports valued at less than $1,250 and exports that are valued at less than $2,500). Air-Data for all air gateways include a low level (generally less than 2%-3% of the total value) of small user-fee airports located in the same region. Air gateways not identified by airport name (e.g., Chicago) include major airports in that geographic area as well as small regional airports. In addition, due to U.S. Census Bureau confidentiality regulations, data for courier operations are included in the airport totals for JFK International Airport, New Orleans, Los Angeles, Cleveland, Chicago, Miami, and Anchorage. Water-Data are preliminary.
SOURCES: Air-U.S. Department of Commerce, U.S. Census Bureau, Foreign Trade Division, special tabulation, May 2002. Water-U.S. Department of Transportation, Maritime Administration, Office of Statistical and Economic Analysis, personal communication, May 2002. Land-U.S. Department of Transportation, Bureau of Transportation Statistics, Transborder Surface Freight Data, 2002.