Thank you for the insight so far...
The final destination is actually Osaka, could do with either ITM or KIX. I see that the best connection is with AC/ANA via HND to ITM (1 stop only). BR to KIX via Taipei would be equally appealing yet a very long layover...
Nevertheless, very few such connections (AC/ANA) available at this stage, and I wonder whether to wait for AC to avail more J seats on more days or "settle" for BR or ANA from one of its US gateways (lots of availability there yet to HND, and hence 2 stops itinerary...)
Any chance being patient would pay off? Is it your experience AC may "come up" with some more J seats? seems like J is EMPTY right now yet no reward seats available!