Originally Posted by
ijgordon
Yes, I know, I was just addressing the fact that on the UK site (per Lawro), you apparently can't change the CC, while on the US site you can. This may be more relevant for Vegas bookings, which typically require a 1-night deposit at the time of booking. On the US site, one can pay that with a non-Platinum card.
Sorry for the sake of clarity and not wanting to offer incorrect info: Both of the accounts that I have previously used to search and book FHR rates didn't have other Amex cards linked to that online account. This may explain the inability to select a different card rather than it being a requirement to use the Platinum/Centurion card.