We (2 travelers) are looking at travel on JAL later this year. Currently, I have a ticket for 1 of us in J with an AA Award, as there’s not availability now for both of us in J.

I feel fairly confident that at some point we will find seats in J closer-in, but I want to protect our travel by booking an economy award. It will be on a different routing, but on the same date. I am looking at booking with Alaska MileagePlan, to at least prevent AA from canceling a duplicate/impossible booking. But will JAL catch this and cancel it?