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

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

2014201520162017
January79.883.486.390.0
February72.574.582.081.4
March88.290.394.296.8
April84.888.691.694.8
May88.592.896.499.5
June92.095.799.9103.7
July96.5101.0104.4108.6
August94.098.6101.8105.8
September83.587.390.491.4
October86.189.592.296.4
November81.784.986.990.3
December86.890.393.096.2
Yr. Total1,034.41,076.91,119.11,154.9
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

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