Interline Brands, based in Jacksonville, Fla., has launched a customer loyalty program that enables its customers to earn American Airlines AAdvantage miles when they purchase products from the company's Barnett, Hardware Express, and Leran brands. Interline Brands is the parent company of Barnett, a national plumbing, HVAC and electrical distributor. Customers can earn up to 4,000 AAdvantage miles per month, based on reaching certain monthly net purchase volumes. The program started Nov. 1, 2004, and runs through 2005.