Get the AA World Mastercard fee free for 6months. They are offering 10K bonus miles with your first purchase. After you receive the 10K bonus miles, you will have 25K miles, enough for a free domestic RT ticket. You can cancel the card when you get the 10K miles and < 6 months and not pay anything for the 10K bonus miles. I believe the offer is good until the end of the year(?) and it was on the AA.com website.