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Table 21. International Available Seat-Miles (ASMs) on U.S. Airlines, Unadjusted, April 2017

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

2014201520162017
January25.826.426.726.9
February23.123.324.523.9
March27.527.527.728.0
April26.827.527.828.7
May28.829.429.8
June30.230.531.1
July31.732.432.9
August31.131.931.9
September27.027.827.9
October26.527.027.4
November24.724.524.0
December26.627.027.3
4 Mo. Total103.2104.7106.7107.5
Yr. Total329.8335.2339.0
Notes: 

Bureau of Transportation Statistics, T-100 Segment

Source: 

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.