If you’d like to make the most out of your air miles credit card, it is in your best interest to stay away from third-party travel sites. While sites like Expedia, Orbitz, and Travelocity are convenient, they may not give you the most bang for your buck. You may still earn miles but you’ll probably receive fewer rewards than you would if you booked directly with the provider or through the card issuer’s own portal. In addition, the miles you earn may not count toward elite status with your credit card. If you like the easy cost comparison aspect of third-party sites, you can always use them to do your research. Once you find the best price, go to the airline website and book there. Pay with Miles is an exclusive benefit for Delta SkyMiles cardholders. It offers the flexibility to apply miles toward the cost of your airfare. You can lower the cost of an airline ticket by $50 for 5,000 miles, $100 for 10,000 miles, and so on. Fortunately, it won’t cost you a penny to use Pay with Miles. You can use it as often as you like, as long as you have enough miles in your account.