There are 3 active planes with the old configuration at the moment: JA787A, JA790A, JA791A, and one plane JA792A in XMN for C check maintenance. All 4 are expected to be flying for the summer schedule.

2 remaining aircraft also with the old seats are JA786A (212 seats) and JA789A (250 seats), but neither have flown passenger service in over a year. Both are currently parked in SBD. Technically, they have not been retired, so we shall see if NH decides to reactivate them for summer.

My guess is that the old configuration will be NRT based, flying NRT-SFO and NRT-LAX taking up exactly 4 aircraft. Technically, it is possible for 4 aircraft to fly HND-ORD-NRT-SFO-NRT-ORD-HND on a 4 day cycle, but that would leave no slack at all in the schedule.

The reason why NRT-HNL might have a few one-off 77W flights is that if this subfleet were isolated to NRT, each aircraft would have 24+ hours on the ground between their 15:25/16:30 SFO/LAX arrival and 17:00 departure the next day. A NRT-HNL-NRT rotation can be complete in less than 24 hours, and the scheduling fits in perfectly with a 20:10 NRT departure and 15:05 arrival the next day. The HNL flights would obviously have to operate at sub-daily frequency so the 77Ws aren't flying 18+ hours per day.