I'd venture to say this is a scam from a third party. Please tread carefully. If it really is FAA, I'm sure they will be patient with you. First, how did you get the message? E-mail? Or as you submitted the info in Behind the Scenes?
can you still log into your account? it will lock if you don't pay. make sure you see where that link goes in your email. then go to your card company and see for yourself. i don't think the site sends anything at all.
Raffi, post the number here and I will have my private investigator check it out for you. There will be a small charge for the service. What is the limit on the card? :-)