Discover Financial Services topped peers in a J.D. Power credit-card customer satisfaction ranking, ousting American Express Co. from the No. 1 spot for the first time in the survey's nine years.

Amex, the biggest credit-card issuer by purchases, slid to second place after it tied for first with Discover last year, according to results released Thursday. Discover captured the top spot with 828 points in a 1,000-point scale, the survey's highest score ever, according to Jim Miller, senior director of banking services at J.D. Power.

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