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A profitability indicator that is calculated by subtracting CASK from RASK.

yield management

The practice of changing availability of seats for each booking code on a flight. This process ensures optimized revenue per seat sold and entails using detailed historical booking, fare, and profit information, with powerful algorithms for implementation. Many airlines use what is called O&D revenue optimization, which creates yield management models across a carrier's entire network, rather than on specific flights only. ATPCO's RBD data provides the link between inventory and price, and is used in these systems.


See Carrier-Imposed (YQ/YR) Fees.


A generic carrier code used for carriers that participate in the IATA agreements. Any participant may use the fares and rules identified by carrier YY.