Why chick fil a are closed on sun?

The decision for Chick-fil-A restaurants to be closed on Sundays was made by founder Truett Cathy in 1946 when he founded his first restaurant. He believed that all restaurant operators and employees should be able to rest, spend time with friends and family, and worship on Sundays. All Chick-fil-A restaurants are closed on Sundays as a result. They are also closed on Thanksgiving and Christmas.