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

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

2014201520162017
January84.382.983.783.4
February83.984.083.482.8
March83.583.982.583.5
April83.882.883.384.0
May84.083.383.583.9
June83.283.783.983.6
July83.083.883.383.7
August83.384.082.583.5
September83.183.883.481.7
October82.784.883.983.7
November82.783.684.084.2
December83.084.283.783.5
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