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Table 19. Systemwide Available Seat-Miles (ASMs) on U.S. Airlines, Unadjusted, April 2017

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

2014201520162017
January79.883.486.390.0
February72.574.581.981.4
March88.290.394.296.5
April84.888.691.694.8
May88.592.896.4
June92.095.799.9
July96.5101.0104.4
August94.098.6101.8
September83.587.390.4
October86.189.592.2
November81.784.986.9
December86.890.393.0
4 Mo. Total325.3336.8354.0362.7
Yr. Total1,034.41,076.91,119.0
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