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Table 20. Domestic Available Seat-Miles (ASMs) on U.S. Airlines, Unadjusted, December 2017

Domestic ASMs (unadjusted) in billions (000,000,000), Scheduled service only

2014201520162017
January54.057.059.763.1
February49.451.357.557.4
March60.762.966.568.7
April58.061.163.866.1
May59.763.466.568.8
June61.865.268.871.7
July64.868.671.574.8
August62.966.770.073.2
September56.559.562.563.1
October59.662.664.868.0
November56.960.562.965.1
December60.363.265.768.2
Yr. Total704.6742.0780.2808.2
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