Cost Per Available Seat Mile - CASM

Cost Per Available Seat Mile - CASM

A common unit of measurement used to compare the efficiency of various airlines. It is obtained by dividing the operating costs of an airline by available seat miles (ASM). Generally, the lower the CASM, the more profitable and efficient the airline.

CASM is usually a more comprehensive measurement of airline costs, but it's still important that investors are aware of what items comprise this measurement. Many carriers exclude fuel costs from operating expenses, making the CASM an unreliable metric. Cost per available seat mile, as the name suggests, reflects the costs incurred by an airline to fly a single seat one mile.


Investment dictionary. . 2012.

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  • Available seat miles — An available seat mile (ASM) is the fundamental unit of production for a passenger carrying airline.[1] 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… …   Wikipedia

  • Low-cost carrier — A Boeing 737 800 operated by Irish budget airline Ryanair …   Wikipedia

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