For the fourth year in a row, American Express has topped the charts in the 2010 J.D. Power and Associates U.S. Credit Card Satisfaction Study. Released last week, the study indicates that AmEx received a customer service ranking of 769 on a 1,000 point scale, which was 12 points higher than the runner up—Discover Card. In addition, AmEx was the only credit issuer to receive five out of five J.D. Power.com Power Circles. Bringing up the rear for the ten major credit issuers analyzed in the study was HSBC, which received a ranking a 686 and just two out of five power circles.