I have used the USA 800 number 3 or 4 times. Hours per the website is 5-16 PST time. I have only called weekdays during that time. Calling as soon as they open is best, otherwise a wait of 20-30 minutes. Generally OK understanding English, some better than others. I had AA book and ticket the ex-TYO ticket, but AA and JL reservations did not always communicate well. Sometimes you have to have AA use the OW liason to have JL cooperate. I used the OW website to get the A class seat ex-TYO (AA never has that available) and then AA ticket. That's where some issues arise, but JL is only the first flight. And anytime JL touches the ticket, there is a 5000 yen ticket fee in addition to any other fees.