Honolulu to Hong Kong to Tokyo to Singapore....need some help.

In a few weeks I have to fly from Honolulu to Hong Kong followed a few days later by a flight to Tokyo-Narita followed a few days later by a flight to Singapore.

As things stand now I have Business Class tickets on United Airlines from Honolulu to Singapore with a changeover in Narita, but the voyage requirements have changed a bit.

Any advice on routes? I would like to keep it Business Class with minimal cost and minimal time in the air. Also I would like to keep it with United/Continental partners so I can get the miles.

On an unrelated note - I read in one of these threads some discussions about DC-8's. Does anyone know where that was? I have some great DC-8 insider knowledge...I fly on DC-8 Combi's on a regular basis.