Thank you for your summary and I know everything that you mentioned, except for #6 on the T or U fares since they are AA specific. And I am fully aware that from PHL, I would have to connect, but I made it clear that I am only willing to connect through my preferred gateways of ORD, DFW, and SFO (and not JFK, SEA, SAN, BOS, YVR), which is why I prefer to depart from my West Coast base of LAX but have not found anything (yet) on JAL.
I am sorry to hear that you "
went through this exercise last month, I believe I tabulated 12 flight per day from the US-TYO. At exactly 331 days out, from all the airports listed, one seat from JFK was released, and 2 from BOS were released" as it's a disappointing search result!
Luckily for me, and THANKS to the wonderful advice and suggestions from
rrgg (who PM me), I was able to EASILY find numerous bookable award seats in Biz Class on JL 6 (on 789) out of ORD at 60K for numerous days in January, February, and March 2024

I have already held 2 Biz Class seats on JL 6 already, pending further poking around.
I truly appreciate
rrgg's thoughtfulness as it exemplifies the spirit of FT where we try our best to help each other.
As a FT member since 2003 with over 3,000 posts, and with Lifetime memberships in United MP, Marriott Bonvoy, and HHonors, as well as Elite status with Hyatt and AA (ExecPlat but using their points for domestic travel only so far), I do my best to help in the areas that I am familiar with and booking premium awards on AA.com with their OW partners is still new to me. So THANK YOU again and kudos to
rrgg!