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Table 7. Systemwide Available Seat-Miles (ASMs) on U.S. Airlines, Seasonally-Adjusted, December 2017

Systemwide (Domestic + International) ASMs (seasonally-adjusted) in billions (000,000,000)

2014201520162017
January84.388.391.495.0
February85.187.692.194.9
March86.488.792.695.2
April85.689.492.595.7
May85.689.793.196.0
June86.289.593.296.8
July86.390.393.397.3
August86.290.693.597.3
September86.690.694.095.4
October87.090.693.397.4
November87.591.193.597.1
December88.191.594.397.7
Notes: 

Available seat-miles are a measure of the capacity of air passenger transportation. An available seat-mile is equal to one aircraft seat carried one mile.

Source: 

Bureau of Transportation Statistics, T-100 Segment