In 2014 U.S. person-miles of travel (including air travel to, from, and within the United States) totaled about 5.4 trillion—an increase of over 100 billion miles from 2013.
NATIONAL TRANSPORTATION LIBRARY (NTL)
The National Transportation Library is a repository for Department of Transportation information, providing library services and serving as a portal for transportation data.
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STATISTICAL POLICIES
As a principal statistical agency, BTS adheres to a number of standards and practices to assure the quality and comparability of its statistics.