My Blue Card has 7.99% Fixed rate, Starwood has 9.99% Fixed rate and my Flex Select Account attached to my Centurion has 11.99% fixed rate. The difference is when I opened the accounts and what the current offers from Amex were at the time.

Back in 2003 Amex was offering Blue Card with Fixed rate 7.99% but Fed funds rate was 1% currently the offer from Amex for the same card seem to be 11.99% but Fed Funds Rate is 5.25%.

I full except Amex to Raise the interest rate on some of my older card with lower interest rates just like BOA recently did to me on my BOA card from 5.99% to 12.99%.