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Table 8. Domestic Available Seat-Miles (ASMs) on U.S. Airlines, Seasonally-Adjusted, August 2017

Domestic ASMs (seasonally-adjusted) in billions (000,000,000), Scheduled service only

2014201520162017
January57.260.363.166.4
February57.960.064.066.4
March58.860.964.566.6
April58.361.564.466.9
May58.261.964.967.2
June58.461.765.167.8
July58.762.265.168.2
August58.762.465.368.4
September59.162.365.3
October59.662.865.3
November59.763.265.5
December60.363.365.9
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