brneyes - We have the Delta Sky Miles American Express Credit Card. For each dollar, you can earn a skymile. Also, every month they have promotions that you log onto and you can earn double miles. If you go to a stand alone gas station, you can earn double miles every time. Anyways, we use it for our monthly expenses and pay it off at the end of the month - we have no finance charge.
After doing that awhile, we just finished redeeming them for two first class tickets from Atlanta to Seattle.
This is exactly what we build the skymiles for.
Hope this help - alot of friends have picked up this card because we live in Georgia and the Hub of Delta is Atlanta. Delta takes us everywhere!