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Table 20. Domestic Available Seat-Miles (ASMs) on U.S. Airlines, Unadjusted

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

2013201420152016
January54.154.057.059.7
February50.049.451.357.5
March59.560.762.966.5
April57.158.061.163.8
May59.159.763.466.5
June60.761.865.268.8
July63.364.868.671.5
August62.162.966.770.0
September55.256.559.562.5
October57.959.662.664.8
November55.556.960.562.9
December57.860.363.265.7
Yr. Total692.3704.6742.0780.2
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