Attention American Express customers: not all, just those of you who have co-branded cards with Delta/Northwest and JetBlue (and some hotels, too):

According to the AP (via ABCNews.com), notices have been sent to these AmEx customers, telling them that starting in January, “rewards won’t be transferred to loyalty accounts with those partners if you are late paying your bill.”

This doesn’t mean you necessarily lose these rewards forever – but you will have to pay a fee to get them back – a $29 fee. And that’s on top of your “late fee”. Ouch.

See the story for further details – or call the number on your card.

Well, at least now you know which of your cards to pay off first…