Some 3.9% of the $88.4 billion of freight moved in February 2013 between the United States and its North American Free Trade Agreement (NAFTA) partners, Canada and Mexico, was transported by air, according to the Bureau of Transportation Statistics (BTS) of the US Department of Transportation. The surface transportation modes of truck, rail and pipeline carried 82.1 percent of the total NAFTA freight flows. BTS reported that air freight flows with Canada was 4.4%, while between the US and Mexico 2.8% of freight was transported by.
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