Originally Posted by theasianguy

JA790A exited XMN on 12/6, and has been flying very limited passenger flights except one rotation of HND-ORD-NRT-ORD-HND and HND-LHR-HND, filling in for JA798A when it got stranded in ANC. It is unconfirmed whether it exited with staggered business or The Room.

After exiting, JA791A has entered XMN on 12/23. Could be for maintenance or reconfiguration.

That leaves only JA787A and JA792A that for sure still have staggered J. They have been flying NRT-LAX-NRT rotations, which requires both planes.

If indeed the remaining 77Ws are going in for reconfiguration, my unfounded hypothesis is that ANA introducing a NEW configuration with fewer J seats and larger Y cabin to specifically serve NRT routes. That could explain why JA790A has seen so little usage since exiting XMN. The 9 frames with 212 configuration are sufficient to serve all the HND routes plus NRT-ORD.