(Index 1994 = 100)
KEY: GDP = gross domestic product; RPMs = revenue passenger-miles.
NOTE: RPM--one revenue passenger transported one mile. International RPMs only include data from U.S. air carriers.
SOURCES: RPM--U.S. Department of Transportation, Research and Innovative Technology Administration,
Bureau of Transportation Statistics, Office of Airline Information, “Airline Traffic Statistics,” special tabulation,
GDP—U.S. Department of Commerce, Bureau of Economic Analysis, “GDP Historical Data, 1929-2004,”