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* J: [[business class]]
* Y: [[economy class]]
In addition, R, A, D, I, Z usually refer to special types of premium class tickets, for instance suites ([[Singapore Airlines]]), [[Emirates (airline)|Emirates]] discounted first and business class, and upgrades. W, T often refer to premium economy class, and B, H, K, L, M, N, Q, T, V, X generally to various types of discounted or restricted economy class tickets.
Booking codes are also sometimes called booking classes or fare classes.
Different levels of [[Frequent-flyer program|frequent flyer miles]] are often awarded based on booking code. For instance, Y economy class may result in a credit of 100% of miles flown, while first and business class 125%, 150%, or even 200%. Discounted economy class may receive a full credit of 100% of miles flown on that operating carrier's program itself, a fraction such as 70%, 50%, 25% credit or even no credit, especially if credited toward a partner airline's program. The details depend on the frequent flyer program, the operating carrier and applicable partnership agreements.
==References==
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