As JAL / ANA are pulling the plug for HND redeye I have no doubt the plane will be filled by ex-HK tourist, and for the NRT redeye it connects to AA DFW flight, the load in the business class should be OK
548 / 549 should warrant the use of A380 (read: slot restricted and high load factor)
The use of redeye might able to share some load of Air Hong Kong's and freighter's cargo load.