Use the Air France or KLM website. Works for me every time. On the AF site enter your e-ticket number minus the last number + your last name in "manage my bookings". Also, jot down your AF confirmation code when it comes up. Scroll down and "select seats". Once you are set on the AF site you can disregard anything showing on Delta. Make sure at T-30 you check in on the AF site, not Delta.