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How is aircraft performance measured?

Density altitude is used in calculating aircraft performance. Under standard atmospheric condition, air at each level in the atmosphere has a specific density; under standard conditions, pressure altitude and density altitude identify the same level.



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Key Airline Metrics Available seat miles is a measure of airline capacity and is calculated by taking the number of seats available and multiplying by the distance flown. Revenue passenger miles is a measure of volume and is calculated by taking the number of passengers and multiplying by miles of flight.

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