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Table 9. International Available Seat-Miles (ASMs) on U.S. Airlines, Seasonally-Adjusted, December 2017

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

2014201520162017
January27.027.828.128.5
February27.327.728.128.6
March27.627.828.228.6
April27.327.928.128.9
May27.427.928.329.0
June27.727.828.329.1
July27.628.128.229.1
August27.528.228.329.0
September27.428.228.328.7
October27.427.828.229.2
November27.827.927.729.0
December27.828.228.429.1
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