I was monitoring 2 x 1st Class JAL, ORD to NRT leading up to availability on AA and AS for 15/16 Sept 2020, using BA as a control to show forward availability. AA showed availability for the 15th a day before it would permit the booking to be completed, and AS also showed availability for a few minutes, but when I attempted to book it, the system wouldn't permit it. But I was able to complete the booking on AA for the 2 seats.
Very glad the blockage is over, and that I was able to secure the seats on either AA or AS.