Slightly OT, but a friend of mine (who was Ivory at the time) used my PE FF# to gain access to NW's preferred seating zone at the time of his booking.
Needless to say his ploy worked and I was not a happy bunny (his rear-end got a quite large number of corrections after the occurrence).
I however alerted AF of the occurrence - beware of people trying this now as you shall (...) get an nicey audit with all of its consequences :-D
UTA