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

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

2014201520162017
January71.073.176.579.1
February71.473.576.878.5
March72.274.476.479.2
April71.773.976.980.2
May71.974.677.7
June71.774.978.3
July71.775.877.9
August71.876.277.3
September72.075.978.3
October72.076.878.3
November72.476.378.6
December73.177.078.8
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