Originally Posted by
BigE
I have the same problem with an AA codeshare on JAL (economy - S fare). AA CS can't see the seatmap. JAL website says it cannot even find any reservation with that reservation number. So, I called in. After waiting for 30 minutes, they finally answered and said that I can't reserve a seat in advance on a codeshare. He wasn't sure I'd be able to do so at online check-in either.
It's ridiculous that, in 2022, JAL's IT can't figure out a way to let people choose a seat.
JAL didn't sell you the ticket. It is AA who needs to handle your request before check-in opens up. Once it's within AA's check-in window, you will be able to complete the check-in process via aa.com.