If you don’t already have a Delta American Express card, you should probably consider this deal. When you sign up for the first time for the Gold Delta SkyMiles Credit Card from American Express, you’ll earn 10,000 bonus miles upon making your first purchase and a 7,500-mile bonus when you charge $7,500 or more within the first five months. That’s 25,000 miles, enough for one free domestic ticket. And, if you spend some of that $7,500 at places eligible for double miles you will earn even more. The places eligible for double miles include stand alone supermarkets, drugstores, gas stations, home-improvements stores and the U.S. Postal Service.