Krystal, a popular fast food chain known for its tiny hamburgers and late night service in the South, has filed for bankruptcy. In its Chapter 11 federal court filing in Atlanta, Krystal Co. cited several contributing factors toward its bankruptcy including increasing competition, shifting consumer tastes and the rise of online delivery platforms."The actions we are taking are intended to enable Krystal to establish a stronger business for the future and to achieve a restructuring in a fast and efficient manner," a Krystal spokesperson said in a statement.It reportedly owes between $50 million and $100 million to food suppliers, equipment companies and others.The 88-year-old company was founded in Chattanooga, Tennessee but moved its headquarters to Georgia in 2013. With more than 300 restaurants and 7,500 employees, Krystal calls itself the South's oldest fast-food chain. It hasn't announced any new restaurant closings linked to the bankruptcy, but it previously closed dozens of locations.What's your favorite Krystal menu item? Share your answers on Facebook here. You can vote on Twitter here.—