As nishimark mentioned it is a fluid situation at KIX where information is changing daily due to the pressure from the government to the airport authority and airlines to get back KIX to the operation. Your flight is on Sept. 27 and a lot can change in next two weeks. Keep checking for the update with JL.
International flights:
Previously the airport authority said there is no set date for reopening of Terminal 1, where JAL uses for domestic and international flights. However, now the airport authority is saying that south portion of Terminal 1 will reopen in next few days. It is possible that JL will resume some international flights out of KIX before Sept. 27.
Airport bridge:
Previously airport authority said train service will resume to KIX sometime in October. However, now the airport authority is saying that the train service to KIX will resume before end of September. It is possible that the train service to KIX will be resumed by Sept. 27.
Keep checking for updates.