Has American Express Platinum lost its luster? By: CNBC.com News March 27, 2014 at 09:43 AM EDT American Express Platinum cardholders are losing some lounge access, but gaining free Wi-Fi. When does the $450 annual fee pay off? Read More >> Related Stocks: Amazon.com American Airlines Gp American Express Delta Air Lines Google, Inc. JPMorgan Chase & Co Southwest Airlines Twitter, Inc.