Originally Posted by
PDXPremier
....If the switch is indeed thrown tomorrow, I still think you'll need to figure out a way to remove and re-enter your AS # since my guess is that AA will be looking at your AS status when the reservation was booked and not after 3/31.
The usual OW way to change freq flyer numbers is the Finnair AY manage booking.
https://www.finnair.com/au/gb/manage-booking-login
Delete freq flyer number. Exit manage booking. Go back in and add "new" ffn. QR QF & UL may also work.
Sometimes also needed when your status level has changed after making a reservation, as some systems do not auto refresh when go up in status.