American Express offers both credit cards and charge cards. The "black card" might be the most well known of all cards and its only real limit is AMEX's judgement of your ability to repay the charges.
The same applies to the Platinum Card- it defaults to being a charge card but they offer people a built in credit card as well. The interest rate on it is insane though, so even though I have it as an option I've literally never used it as a credit card.
