In Southwest, capacity can be measured in available seat-miles (AMS) per month.
In passenger transportation, available seat miles (ASM) or available seat kilometers (ASK) is a measure of passenger carrying capacity.
It is equal to the number of seats available multiplied by the number of miles or kilometers traveled by a vehicle.
In the airline industry an available seat mile is the fundamental unit of production for a passenger-carrying airline.
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.
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