|Domestic freight ton-miles||4.5||9.1||12.5||15.0||13.1||13.9||15.2||16.9|
|International freight ton-miles||3.4||7.3||10.9||15.9||14.9||16.7||18.3||20.3|
|Total freight ton-miles||7.9||16.5||23.4||30.9||28.0||30.6||33.5||37.3|
NOTE: The air ton-miles for U.S. imports and exports are from air cargo handled at U.S. airports by U.S. and foreign air carriers.
SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, based on Office of Airline Information data in National Transportation Statistics 2005 online version, available at http://www.bts.gov/publications/national_transportation_statistics/ as of September 2005.