The Delta SkyMiles Gold American Express Card offers benefits such as a free checked bag, priority boarding, and double miles on dining and groceries. The free checked bag saves $70 on a roundtrip flight and applies to up to nine people on the same reservation. Priority boarding ensures overhead bin space. Earn 2 miles per dollar at restaurants, U.S. supermarkets, and Delta purchases. Consider the annual fee and SkyMiles value before applying. The annual fee is $0 intro annual fee for the first year, then $150.