Legacy carriers in the United States, such as American Airlines, have gradually grown their loyalty programs into advanced, complex, and multifaceted systems that not only generate a significant portion of the company's revenue but also offer extra benefits and perks to an airline's most loyal fliers. The American Airlines AAdvantage Loyalty Program offers one of the most elaborate elite status schemes on the market today, one which rewards frequent fliers and other high-spenders for their continued loyalty to the carrier..
