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Table 11. Domestic Load Factor on U.S. Airlines, Seasonally-Adjusted, December 2017

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

2014201520162017
January85.283.884.984.4
February85.085.184.683.8
March84.985.283.484.6
April84.684.484.784.8
May84.984.385.185.2
June84.485.085.284.6
July84.684.984.284.8
August84.485.283.784.3
September84.185.184.582.4
October83.685.985.185.2
November84.084.684.985.5
December84.085.884.884.8
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