American Express and Discover Financial Services once again were kings of the mountain in an annual survey of consumers' experience with credit cards.

In J.D. Power's annual U.S. Credit Card Satisfaction Study, American Express and Discover tied for the top spot. American Express had been the top-ranked issuer in all eight years J.D. Power has performed the study. But Discover has always ranked high as well, and this year received the same score as American Express.

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