I'm about to book an economy flight on Cathay HKG-LHR and there are three fare classes quoted on the web site: Save, Core and Standard. The only difference appears to be the ability to pre-book seats and upgrade with miles.

All three have identical HKD1800 cancellation charge.

Does Cathay really not sell 100% refundable tickets? IIRC there used to be such a thing in the airline world. Cheap tickets were fixed and not refundable but full fare tickets were refundable and reservations could be moved up to the moment of departure. Does such a flexible ticket not exist any more? Certainly cannot book it on their web site.

Thanks.