NOTES: AirValues for some airports may include a low level (generally less than 2 percent of the total value) of small user-fee airports located in the same regional area. In addition, due to the Census Bureaus confidentiality regulations, data for nearby individual courier operations (e.g., DHL, Federal Express, United Parcel Service) are included in the airport totals for New York Kennedy, New Orleans, Los Angeles, Cleveland, Chicago OHare, Miami, and Anchorage. LandData include transshipments between the United States and Mexico. Trade levels reflect the mode of transportation as a shipment entered or exited a U.S. Customs port. Includes truck, rail, pipeline, and other modes of land transportation.
SOURCES: AirU.S. Department of Commerce, Census Bureau, Foreign Trade Division, special tabulation. Maritime and Great LakesU.S. Department of Transportation, Maritime Administration, Office of Statistical and Economic Policy, U.S. Waterborne Exports and General Imports, Annual 1997 (Washington, DC: 1998). LandU.S. Department of Transportation, Bureau of Transportation Statistics, Transborder Surface Freight Data, 1998.