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Table 18. International Revenue Passenger-Miles (RPMs) on U.S. Airlines, Unadjusted, December 2017

International RPMs (unadjusted) in billions (000,000,000), Scheduled service only

2014201520162017
January20.520.821.221.3
February17.317.518.117.8
March21.821.822.022.1
April21.521.221.523.2
May23.723.823.724.5
June25.525.726.227.2
July26.827.828.329.1
August26.627.426.927.9
September22.122.622.722.8
October21.222.022.022.4
November18.819.118.919.8
December21.521.722.222.7
Yr. Total267.2271.6273.5280.6
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