[Ref. The Global Airline Industry Edited By Peter Belobaba, Amedeo Odoni and Cynthia Barnhart © 2009 John Wiley & Sons, L td. ISBN: 978-0-470-74077-4]

Available Seat Kilometer (

ASK) is the most common measure ofairline output (capacity). It’s defined as one available seat flown 1 kilometer:ASK = Num. of seat available x KM traveled

ASK is also known as Available Seat Mile (ASM), which is the most common measure of airline out. For example, if a flight can offer 200 seats and the route has 1000 km, then it generates 200 x 1000 = 200,000 ASK of airline output.

ASK is closely related to the unit cost, which is an important measure of cost efficiency, both over time and across airlines.

*Notes:*

*RPK is related to airline traffic – how much seats are sold as well as how much an airline can earn;*

*ASK is related to airline output – how much seats can be offered as well as the cost efficiency*

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