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

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

2013201420152016
January83.484.388.391.5
February84.785.087.491.9
March83.686.388.692.4
April83.885.689.492.5
May84.185.689.793.1
June84.186.289.693.5
July84.086.390.493.5
August84.686.290.693.6
September84.586.690.593.6
October84.987.190.893.6
November85.087.591.193.3
December84.888.191.494.1
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