RASK is the revenue an airline earns per seat and kilometer offered, whether filled or not. It is the airline sibling of hotel RevPAR: it blends price and occupancy into one figure comparable across routes. Set against cost per seat-kilometer it says whether the operation is profitable.
Example A route with high RASK but even higher CASK loses money no matter how full it flies.
RASK stands for Revenue per Available Seat Kilometer, the revenue an airline earns for each seat flown one kilometer, whether occupied or empty.
How is RASK calculated?
Divide total passenger revenue by available seat kilometers (ASK). For example, if a route generates 100,000 euros and offers 2 million ASK, the RASK is 5 euro cents per seat kilometer.
What is RASK used for and how is it different from yield or load factor?
RASK combines price and occupancy into one metric, unlike yield which only shows revenue per paid passenger kilometer. It helps compare commercial efficiency across routes or airlines. A high RASK can make a route profitable even with average load factor if fares are strong.
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