Was just about to post about this, the reservation feature have been down for over 24h for me now, it is rather irritating ! You can actually check some things via the NW website, change seats and add FF no but it is not the same.
Originally Posted by Dambus
The only other way to add an FD number to a web booking seems to be to call the premium rate web support numbe
Just go to nwa.com
Reservation Center -> Manage My Reservations -> View/Change My Reservations
