If past card revamps are any indication, the annual fees on Amex Platinum and Business Platinum will almost certainly see increases as part of the planned changes. But just how high could they go?

The price jump is part of an ongoing shift for credit card companies and airlines toward premium rewards and high-end travelers.

JPMorgan Chase is hiking the annual fee of its popular Sapphire Reserve credit card by 45% as part of a major overhaul to attract high-spending millennials.