NEW YORK--(BUSINESS WIRE)--American Express today unveiled major enhancements to its U.S. Consumer and Business Platinum Cards. Available immediately, the updated Platinum Cards now offer expanded lifestyle and business benefits, access to over $3,500 in annual value, and a limited-edition mirror card design. These enhancements build on the existing benefits Consumer and Business Platinum Card® Members already enjoy, offering even more value in relevant categories across travel, dining, enterta. ...