CASK is the cost to an airline of offering each seat and kilometer. It is the yardstick for a carrier's efficiency and where low cost airlines win their edge over legacy ones. If revenue per seat-kilometer does not beat CASK, every flight subtracts.
Example A low cost with low CASK can sell cheap and still profit where a legacy carrier loses.
RASK is the revenue an airline earns per seat and kilometer offered, whether filled or not. It is the airline...
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