American Airlines is one of the most popular airlines in the United States. They fly nearly 6,700 daily flights to 350 destinations across the U.S. and internationally in 50 countries. American Airlines frequent flyer program, AAdvantage, was created in May 1981, and we’ve been focused on the best ways to earn more miles ever since. And with so many choices available among the American Airlines credit cards, earning AAdvantage miles is incredibly easy and lucrative.