American Express Travel Related Services Co. has made its long-awaited entry into credit card cobranding, through a marketing partnership it announced Tuesday with Delta Airlines.

The companies had long been rumored to be nearing a cobranding arrangement. Delta, which will call the joint card Delta SkyMiles Optima, was the last major airline without a credit card partner, and its link with American Express will set it apart from those that market MasterCard and Visa brands.

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