Chick-fil-A

With 3,000+ US locations generating over $21 billion in annual sales, Chick-fil-A posts the highest average unit volume of any major fast-food chain in the country, at roughly $8.7 million per restaurant. Its central role in the 2019 'chicken sandwich wars' with Popeyes drew national attention, and the chain's hospitality-focused culture is frequently used as a business school case study.