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Table 8. Domestic Available Seat-Miles (ASMs) on U.S. Airlines, Seasonally-Adjusted

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

2013201420152016
January57.357.360.563.4
February58.257.859.963.9
March57.558.760.864.3
April57.458.361.464.2
May57.658.261.864.7
June57.658.461.765.1
July57.558.762.265.2
August57.958.762.465.4
September57.859.162.365.4
October57.959.662.865.3
November58.059.763.265.6
December58.060.363.365.9
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