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NOTE: Load factor is a measure of the use of airline capacity equal to revenue passenger-miles (RPMs) divided by available seat-miles (ASMs). RPM is a measure of airline travel; one RPM is equal to one passenger flown one mile. ASM is a measure of airline capacity; one ASM is equal to one seat flown one mile.
SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, Office of Airline Information, “Airline Traffic Statistics,” special tabulations as of April 2006.