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available seat miles
Available seat miles (ASM) or Available seat kilometres (ASK) 〔(What is ASK - YouTube Video )〕 is a measure of an airline flight's passenger carrying capacity. It is equal to the number of seats available multiplied by the number of miles or kilometres flown. An available seat mile is the fundamental unit of production for a passenger-carrying airline.〔ATA handbook 〕 A unit in this case is one seat, available for sale, flown one mile. For example, an aircraft with 300 seats available for sale flying 1,000 statute miles would generate 300,000 ASMs for that particular flight. That the seats are available for sale is critical. An aircraft that had 300 seats but which was limited (for regulatory or technical reasons) to selling only 250 of them on a particular flight of 1,000 miles would generate 250,000 ASMs on that flight, not 300,000. Similarly, if passenger seats on a particular flight are dedicated to crew rest purposes, such seats would not be included in the calculation of ASMs for that flight.
== Related quantities ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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