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Table 10. Systemwide Load Factor on U.S. Airlines, Seasonally-Adjusted, May 2017

Systemwide (Domestic + International) RPMs/ASMs (both seasonally-adjusted) in percent, Scheduled service only

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2014201520162017
January84.383.083.883.4
February83.884.083.482.8
March83.784.082.683.4
April83.882.783.384.0
May84.083.183.483.9
June83.183.683.8
July83.183.983.4
August83.384.182.5
September83.183.983.6
October82.784.683.6
November82.883.784.2
December82.984.183.6
Notes: 

Load factor is a measure of the use of aircraft capacity that compares Revenue Passenger-Miles (RPMs) as a proportion of Available Seat-Miles (ASMs).

Source: 

Bureau of Transportation Statistics, T-100 Segment