Originally Posted by jiejie

Within each airline, the discount level maps to a specific fare class, but is not uniform across Chinese airlines. I can't seem to locate my handy cheat sheet, but in general, full fare economy maps to Y (all airlines), 5% discount maps to B (most airlines), and 10% and 15% the letter code varies but maps to the next two highest fare classes. Usually these do get some sort of mileage accrual in their own and alliance partner FFP's. 20% discount level is on the bubble and also may depend on the specific partner FFP. Any discount higher than that and you can pretty much kiss goodbye any accrual. Premium economy may or may not get you any more mileage than Y fare class. Business and first should be pretty safe for accrual though heavily discounted premium fares might accrue lower.