Chick-fil-A Likely Loses Out on More Than $1 Billion in Sales Every Year by Closing on Sundays — and It’s a Brilliant Business Strategy Posted byKate Taylor July 31, 2019 Leave a comment on Chick-fil-A Likely Loses Out on More Than $1 Billion in Sales Every Year by Closing on Sundays — and It’s a Brilliant Business Strategy The chicken chain’s founder, Truett Cathy, decided to close all locations on Sundays because of his Christian faith.