Table 4-21. Energy Intensity of Certificated Air Carriers, All Services^a

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^a U.S. owned carriers only. Operation of foreign-owned carriers in or out of the United States not included.
^b Calculation based on unrounded figures not shown here.

KEY: Btu = British thermal unit; R = revised.

NOTES: Aircraft-miles includes all four air-carrier groups (majors, nationals, large regionals, and medium regionals), scheduled and charter,  passenger, and all-cargo. Fuel consumed includes majors, nationals, and large regionals, scheduled and charter, passenger, and all-cargo. Passenger-miles includes all four air-carrier groups, scheduled and charter, passenger service only. International operations include operations outside the United States, including those between the United States and foreign countries and the United States and its territories or possessions. 
Domestic and international load factor values for 1999 are derived by calculation.
Heat equivalent factor used for Btu conversion is 135,000 Btu/gallon.

SOURCES: 
Aircraft-miles, available seat-miles, passenger-miles, and load factor: 
1960-80: Air Transport Association, Internet site http://www.air-transport.org/public/industry, as of July 5, 2000.
1985-98: U.S. Department of Transportation, Bureau of Transportation Statistics, Office of Airline Information, Air Carrier Traffic Statistics (Washington DC: Annual December issues).
Fuel consumed: 
1960-99: U.S. Department of Transportation, Bureau of Transportation Statistics, Office of Airline Information, Internet site http://www.bts.gov/oai/fuel/fuelyearly.html, as of July 5, 2000.
Seats per aircraft, seat-miles per gallon, and energy intensiveness: Derived by calculation.