Originally Posted by
demue
If you are so interested in flying Biz on that short hop between CGK-SIN or SIN-CGK (I don't recall exactly your routing) then consider a mileage upgrade using KF miles maybe which should be possible even now (assuming your fare is eligible and there is upgrade space). YMMV.
CGK J is hard. All my CGK tagged under long hauls has never cleared WL. Another failed CGK WL is in 3 days time. And this one ex-CDG.