(Billions (or thousand millions) of passenger-kilometers)
Air: The U.S. total for air represents both air carriers and general aviation. However, only the large certificated air carriers are included. See Appendix B for a more complete explanation. The Mexican air total represents only scheduled air carriers. However, nonscheduled and general aviation represents a very small share of passenger travel in Mexico. Canadian data for total air activity are nonexistent because data for general aviation are not collected.
Road: Data do not include passenger travel by commercial freight vehicles.
Transit and water transport: For the United States, ferry activity is included in the total for transit. For Mexico, data for overall transit activity are nonexistent because the data are not collected. However, Mexican data for water transport do represent ferry activity. Canadian data for transit overall and ferry activity are nonexistent because the data are not collected.
Air carriers: Includes Level I to III Canadian air carriers. For a definition of these, See Appendix B.
Air: Data for general aviation are not included in the air total.
Intercity bus: Data refer to intercity buses utilizing Mexico's federal highway system.
Passenger-kilometers, total: Is not the sum of the subcategories because local motor bus is included in both the road and transit totals. This double counting has been removed from the overall total.
Air carriers: Statistics Canada. Canadian Civil Aviation, Catalogue No. 51-206-XPB. (Ottawa, Ont.: various years).
Road: Transport Canada. Ministry of Public Works and Government Services. Transportation in Canada 1997 - Annual Report. (Ottawa, Ont.: 1998).
Rail: Statistics Canada. Rail in Canada, Catalogue No. 52-216-XPB. (Ottawa, Ont.: various years).
Air: Secretaría de Comunicaciones y Transportes. Dirección General de Aeronáutica Civil. (Mexico City, D.F.: 1998).
Road: Secretaría de Comunicaciones y Transportes. Dirección General de Autotransporte Federal. (Mexico City, D.F.: 1997).
Rail: Ferrocarriles Nacionales de México. Series Estadísticas, 1990, 1995 and 1996. (Mexico City, D.F.: various years).
Water transport: Secretaría de Comunicaciones y Transportes. Coordinación General de Puertos y Marina Mercante. (Mexico City, D.F.: 1998).
Air: U.S. Department of Transportation. Bureau of Transportation Statistics. Office of Airline Information. Air Carrier Traffic Statistics. (Washington, DC: 1986-1997).
U.S. Department of Transportation. Federal Aviation Administration. Statistical Handbook of Aviation 1996. Web site: www.bts.gov
Road: U.S. Department of Transportation. Federal Highway Administration. Highway Statistics, Summary to 1995. (Washington, DC: 1996).
U.S. Department of Transportation. Federal Highway Administration. Highway Statistics, 1996. (Washington, DC: 1997).
American Public Transit Association (APTA). Transit Fact Book. (Washington, DC: various years).
Intercity passenger rail: National Railroad Passenger Corp. Amtrak Annual Report 1996. (Washington, DC: 1996).
Transit rail: American Public Transit Association. Transit Fact Book. (Washington, DC: various years).