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SOURCES: Air carrier, domestic, scheduled service (passenger): U.S. Department of Transportation, Bureau of Transportation Statistics, Office of Airline Information, TranStats Database, T1: U.S. Air Carrier Traffic and Capacity Summary by Service Class, available at http://www.transtats.bts.gov/ DL_SelectFields.asp?Table_ID=264&DB_Short_Name=Air%20Carrier%20Summary as of Aug. 31, 2015 and Air Carrier Financial Reports, Schedule P-1.2, available at http://www.transtats.bts.gov/databases.asp?Mode_ID=1&Mode_Desc=Aviation&Subject_ID2=0 as of Aug. 31, 2015. Commuter rail: 1990-2001: American Public Transportation Association, 2011 Public Transportation Fact Book (Washington, DC: 2011), tables 2 and 42 (passenger fares / passenger miles). 2002-13: U.S. Department of Transportation, Federal Transit Administration, National Transit Database, Data Tables 19 and 26 (Washington, D.C.: Annual reports), available at http://www.ntdprogram.gov/ntdprogram/data.htm as of Aug. 31, 2015. Intercity / Amtrak: 1990-2002: National Passenger Rail Corporation (Amtrak), Amtrak Annual Report, Statistical Appendix (Washington, DC: Annual Issues) (transportation revenues / passenger-miles). 2003-13: Association of American Railroads, Railroad Facts (Washington, DC: Annual Issues), p. 77 and similar pages in previous editions (passenger revenue/revenue passenger miles). Consumer Price Index: U.S. Department of Labor, Bureau of Labor Statistics, Consumer Price Index-Urban, U.S. All Items Indexes, available at http://www.bls.gov/cpi/ as of Aug. 31, 2015. Air carrier, domestic, scheduled service (freight): U.S. Department of Transportation, Bureau of Transportation Statistics, TranStats Database, T-1, Schedule P-11, and Schedule P-12 data, available at http:// www.transtats.bts.gov/ as of Sep. 1, 2015, special tabulation. Truck: 1990-2003: Eno Transportation Foundation, Inc., Transportation in America (Wash- ington, DC: 2007), p. 46. 2004-07: U.S. Department of Commerce, U.S. Census Bureau, 2009 Transportation Annual Survey (Washington, DC: January 2011), table 2.1, available at http://www.census.gov/services/ as of Aug. 9, 2011, special tabulation. Class I rail: Association of American Railroads, Railroad Facts (Washington, DC: Annual Issues), p. 34 and similar pages in previous editions. Producer Price Index: U.S. Department of Labor, Bureau of Labor Statistics, Producer Price Index-Commodities, available at http://www.bls.gov/ppi/ as of Sept. 1, 2015.