Definition of available seat mile in English English dictionary
A measure of an airline flight's passenger carrying capacity. It is equal to the number of seats onboard an aircraft multiplied by the distance flown in miles. Seats that are not available for sale to revenue-paying passengers (e.g., seats reserved for crew rest, etc.) are excluded from this calculation
The unit operating cost of a carrier, also known as unit cost. The cost, expressed in cents to operate each seat mile offered. Determined by dividing operating costs by ASM (available seat miles)