Originally Posted by
benewr
\If I use the credit only for 1 person, there will be 900 euros remaining but this person is not likely to fly to the US again so it would be lost for ever when it couls go to booking the other person.
FFC is limited to the original ticketed passenger(s). That's intentional, by the airlines, as they do not want people being able to re-sell their tickets (or credit) on a secondary market.