Hello! Would someone be able to check this route for me? No availability showing in the BA search for Y. Only J available.

KIX to PVG
JL0897
4 Jun (14:45 to 16:20)

Thanks so much.

PS: I saw in another thread that availability opens up for JAL domestic flights roughly 60 days before flight. This isn't domestic, but it's short-haul. This doesn't hold true for my flight, correct?