Chick-fil-A has that secret sauce: a hold on its customers that every other restaurant wants. It’s become the top fast-food chicken chain in the country, beating out Popeyes and KFC. It’s also the third-largest restaurant chain in the U.S. by sales overall (not just counting chicken spots), despite having fewer locations than Sonic Drive-In or Papa John’s. Part of that success may be thanks to Americans eating more chicken, with annual consumption projected to keep climbing.