Established in 1953, Sonic Drive-in, a subsidiary of SONIC Corp., is one of the leading chains of drive-in restaurants in the United States. Based in Antlers, Okla, the franchisee operates more than 3,500 chain outlets in 43 states. Serving nearly 3 million customers each day, the restaurant offers a variety of food under burgers, coneys, chicken, snacks and sides, salads, kid's meal and breakfast items. Its specialty menu includes Toaster sandwiches, Ex-Long Chili Cheese Coneys, Footlong Quarter Pound and Tater Tots. Sonic Drive-in offers a line-up of Fountain Favorites drinks, such as slush's, juices, teas, fruits and flavors with more than 168,000 drink combinations.