Originally Posted by
gluedtothewindow
If you're in the US, call JL at 1-800-525-3663 and ask for your AAdvantage number to be added to the itinerary. Have your 6-digit JL reservation number ready.
Then, at check-in, double check your number was added. If not, they should still be able to add it then.
Plus:
If you booked by AA, you can call AA and add
If u booked on AA.COM it will add automatically if u were logged in
If you booked througth a travel agnet, thay can add for you