Do you have to assign passport information to your EC? When you assign your FF details to a flight, does taking that flight credit passport info in addition to miles/points to that accont. Was wondering how that worked, i know it's a silly question. Also, what if you were to have 2(for whatever reason) FF accounts in the same scheme. Would the scheme notice that said person(passport info etc) has already been assigned to another FF account in that scheme?