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

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

2014201520162017
January54.057.059.763.1
February49.451.357.557.4
March60.762.966.568.5
April58.061.163.866.1
May59.763.466.5
June61.865.268.8
July64.868.671.5
August62.966.770.0
September56.559.562.5
October59.662.664.8
November56.960.562.9
December60.363.265.7
4 Mo. Total222.1232.3247.5255.1
Yr. Total704.6742.0780.2
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