Does anyone know if you can enter a child's Alaska Airlines (AS) frequent flyer number for a flight booked through Iceland Air (FI)? In their booking screen it has a drop-down to enter the adults' numbers and you just select Alaska instead of Saga, but for a child under 12 it automatically removes the field, since Saga isn't available for under 12. If I book it, will I be able to add it later or do they not allow it since they already discount the fares for under 12 year olds? Was going to contact them tomorrow when they're open, but thought someone here might know.