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Table 8. Domestic Available Seat-Miles (ASMs) on U.S. Airlines, Seasonally-Adjusted, May 2017
Domestic ASMs (seasonally-adjusted) in billions (000,000,000), Scheduled service only
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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.
Bureau of Transportation Statistics, T-100 Segment