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

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

2014201520162017
January71.073.276.579.2
February71.473.676.878.6
March72.274.476.479.5
April71.774.077.180.4
May71.974.777.780.6
June71.674.978.280.9
July71.675.677.781.4
August71.876.177.181.2
September72.075.978.477.9
October72.076.878.281.5
November72.476.278.581.8
December73.177.179.081.6
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