Available Seat Kilometers (ASK) is a key performance metric used in the airline industry. It measures the total number of seats available for sale multiplied by the distance flown in kilometers. This metric helps airlines assess their capacity and efficiency in transporting passengers. ASK is important for understanding an airline's operational performance. A higher ASK indicates more available capacity, which can lead to increased revenue potential. Airlines often analyze ASK alongside other metrics, such as Revenue Passenger Kilometers (RPK), to evaluate their overall performance and profitability.