oh, I posted the previous message a bit too early...just got something from CX this past weekend, talking about their "sub-class re-alignment"...now their economy sub-classes are classified as follows:

Full Fare Economy: Y, B
Discounted Economy: H, K, M, L, W

Some other changes with its airline partners:

For travel on Canadian Airlines, in sub-classes A, B, G, H, K, M, N, O, P, Q, V, X and Z, you'll earn 50% of the miles (or sectors) flown, sub-class R will earn 100% of the mileage flown and sub-class W is deleted. (In the original terms and conditions, all these 15 sub-classes are listed as discounted economy)

For travel on Japan Airlines (international flights) and Japan Asia Airways, you'll earn 50% of the mileage flown in the following sub-classes - B, Q, M, N, X, G. Sub-class H is no longer ineligible for earning mileage credits. For travel with discount economy tickets (except group fares and industry travel fares) on Japan Airlines, domestic flights will earn 50% of the miles flown.