The Delta SkyMiles Gold American Express Card offers a 40,000-mile welcome bonus after spending $1,000 within three months of account opening (plus, earn up to $50 back in statement credits for eligible purchases at U.S. restaurants within the first three months of membership), and 2x SkyMiles for each dollar you spend on Delta purchases, restaurants, and U.S. supermarkets. You also get perks like a free checked bag, priority boarding, and a 20% discount on in-flight purchases.