ASK (available seat kilometres)

Available Seat Kilometres (ASK) measures an airline's passenger carrying capacity. It is:

seats available ×distance flown

This number should be calculated per plane, but is (at least in an investment context) usually quoted per airline.

A seat-kilometre is available when a seat that is available for carrying a passenger is flown one kilometre. Seats that are not usable for various reasons are excluded.

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