American Express in particular are very quick to decline and block payments that they think are out of the ordinary.
A lot of the time they aren't actually declined but "Referred" which means the card company wants you to get in touch and verify the payment.
On a related note, how quickly does USCarhire normally charge a credit card?
I booked a car on the 30th July and there is still no charge for the deposit on my card. My confirmation came through okay so i'm assuming everythings okay and i've managed to do it at just the right time to get an extra months credit, but these days transactions are usually very swift.
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