Chick-fil-A is now the third largest restaurant chain by system-wide sales. Its ascent has been so rapid that other fast-food brands are taking note of its unique business model. Popeyes recently launched its own chicken sandwich leading the two brands into a social media war. But how is it that a restaurant that's ensnared in controversy, and closed on Sundays, next in line to overtake Starbucks and McDonald's? » Subscribe to CNBC: https://cnb.cx/SubscribeCNBC » Subscribe to CNBC TV: https://cnb.cx/SubscribeCNBCtelevision » Subscribe to CNBC Classic: https://cnb.cx/SubscribeCNBCclassic About CNBC: From 'Wall Street' to 'Main Street' to award winning original documentaries and Reality TV series, CNBC has you covered. Experience special sneak peeks of your favorite shows, exclusive video and more. Connect with CNBC News Online Get the latest news: https://www.cnbc.com/ Follow CNBC on LinkedIn: https://cnb.cx/LinkedInCNBC Follow CNBC News on Facebook: https://cnb.cx/LikeCNBC Follow CNBC News on Twitter: https://cnb.cx/FollowCNBC Follow CNBC News on Instagram: https://cnb.cx/InstagramCNBC #CNBC #CFA #ChickFilA The Rise Of Chick-fil-A