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Table 4. Systemwide Revenue Passenger-Miles (RPMs) on U.S. Airlines, Seasonally-Adjusted, August 2017

Systemwide (Domestic + International) RPMs (seasonally-adjusted) in billions (000,000,000), Scheduled service only

2014201520162017
January71.073.176.579.1
February71.473.576.778.5
March72.274.576.579.3
April71.774.077.080.3
May71.974.677.780.6
June71.674.978.381.0
July71.875.877.981.6
August71.876.277.281.3
September72.075.978.3
October72.076.878.2
November72.476.278.6
December73.076.978.7
Notes: 

Revenue passenger-miles are a measure of the volume of air passenger transportation. A revenue passenger-mile is equal to one paying passenger carried one mile.

Source: 

Bureau of Transportation Statistics, T-100 Segment