Figure 3-4 U.S. Airline Revenue Passenger-Miles, Available Seat-Miles, and Load Factor: January 2003–December 2015
NOTES: Includes domestic and international scheduled services. Revenue passenger-miles (RPM) are a measure of the volume of air passenger transportation. An RPM is equal to one paying passenger carried one mile. Available seat-miles (ASM) are a measure of capacity of air passenger transportation. An ASM is equal to one aircraft seat carried one mile. Load factor is a measure of the use of aircraft capacity that compares RPMs as a proportion of ASMs.
SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics, T-100 Segment Data, available at www.transtats.bts.gov as of March 2016.