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Table 7. Systemwide Available Seat-Miles (ASMs) on U.S. Airlines, Seasonally-Adjusted, June 2017

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

2014201520162017
January84.288.191.294.8
February85.187.692.194.9
March86.488.892.795.2
April85.689.492.595.8
May85.689.793.196.1
June86.289.593.396.9
July86.390.393.4
August86.290.593.5
September86.690.593.6
October87.190.793.6
November87.591.193.3
December88.191.594.3
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