I have a related issue. JL flight number booked by AA (001 ticket) and have the JL PNR. The website says that there is an error. I call JL reservations in US and they can see everything and it appears OK but AA must confirm it. JL reservations told me that I could be denied boarding. AA says all OK and confirmed. AA contacted OW who called JL and OW said it is OK. It's a RTW where JL is the 1st and only flight.