American Ex-press Co. said its customers who carry the Delta SkyMiles Optima card will be eligible to earn two miles for each dollar spent with cooperating merchants.

The DoubleMiles partners are Hertz, Hilton, Flower Club, Olive Garden, Renaissance Cruises, Red Lobster, and MCI.

Cardholders normally get one mile for each dollar they spend, with a bonus for Delta Airlines tickets.

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