I've redeemed 2 tickets (HKG-KIX, J cabin), right now KIX->HKG I can only get CX567 on Feb 21, 2015, but I would like to have CX507/561/595 (same day), possible to waitlist for them? And usually what time will they release those unsold seat to people on waitlist? (may be they don't do?) Since I also need to plan my hotel stay according to the flight schedule.