Review: Is the Delta SkyMiles Platinum American Express the best credit card for you? Along with a welcome bonus of 90,000 bonus miles after you spend $3,000 in purchases in the first 3 months from account opening, one Delta SkyMiles® Platinum American Express Card benefit can easily wipe out the annual fee cost (and then some). Each year on your card anniversary, you'll receive a Delta companion certificate to use when you book an eligible paid Delta flight. A companion can come along with you for just the cost of taxes and fees — and on expensive routes, the savings can be substantial. Related