Originally Posted by
OnePassenger
My ['free'] partner card miles especially needed several phone calls to post the miles to my account.
What do you mean? The extra card expenses do not generate separate mile crediting on FB account.
All cards (main cards, extra cards, additional card) belong to the same Amex account. The total amount of spendings with all cards shows on the Amex statement and is then translated into miles that go the FB account of the main card holder.