Chick-fil-A (a play on the American English pronunciation of fillet) is one of the largest American fast food restaurant chains Its headquarters are in College Park, Georgia. Chick-fil-A was originally founded as the Dwarf Grill in 1946, changing the name to 'Dwarf House' until rebranding as Chick-fil-A in 1967. The company operates more than 2,300 restaurants, primarily in the United States with locations in 47 states and plans for a location in Hawaii to be the 48th state. The restaurant serves breakfast before transitioning to its lunch and dinner menu. Chick-fil-A also offers customers catered selections from its menu for special events. Many of the company's values are influenced by the religious beliefs of its late founder, S. Truett Cathy, a devout Southern Baptist. All Chick-fil-A restaurants are closed for business on Sundays, as well as on Thanksgiving and Christmas. The company's stance in opposition to same-sex marriage has been the subject of public controversy.

Wendy's is an American international fast food restaurant chain founded by Dave Thomas on November 15, 1969, in Columbus, Ohio. The company moved its headquarters to Dublin, Ohio, on January 29, 2006. As of December 31, 2018, Wendy's was the world's third-largest hamburger fast-food chain with 6,711 locations, following Burger King and McDonald's. On April 24, 2008, the company announced a merger with Triarc Companies Inc., a publicly-traded company and the parent company of Arby's. Wendy's headquarters remained in Dublin. Following the merger, Triarc became known as Wendy's/Arby's Group, and later as The Wendy's Company. As of December 31, 2018, there were a total of 6,711 locations, including 353 that are company-owned and 6,358 that are franchised; 92% of the system-wide locations are in North America. While Wendy's determines standards for each store's exterior appearance, food quality, and menu, the store owners have control over hours of operations, interior decor, pricing, staff uniforms, and wages. The chain is known for its square hamburgers, sea salt fries, and Frosty, a form of soft-serve ice cream mixed with starches. Wendy's menu consists primarily of hamburgers, chicken sandwiches, French fries, and beverages such as the Frosty. Since phasing out their "Big Classic", the company does not have a signature sandwich, such as the Burger King Whopper or the McDonald's Big Mac, Dave's 1/4 lb Single was introduced in 2011 as Dave's Hot 'N Juicy, a reworking of the longstanding Wendy's Single (shortened to simply Dave's in 2016), a square-pattied burger made with fresh ground beef rather than round frozen patties. Wendy's uses square hamburger patties – which hang over the edge of a circular bun – as its signature item.

In-N-Out Burger is an American regional chain of fast food restaurants with locations primarily in the Southwest and the Pacific coast. It was founded in Baldwin Park, California, in 1948 by Harry Snyder and Esther Snyder. The chain is currently headquartered in Irvine, California and has expanded outside Southern California into the rest of California, as well as into Arizona, Nevada, Utah, Texas, and Oregon. The current owner is Lynsi Snyder, the Snyders' only grandchild. As the chain has expanded, it has opened several distribution centers in addition to its original Baldwin Park location. The new facilities, located in Lathrop, California; Phoenix, Arizona; Draper, Utah; Dallas, Texas; Colorado Springs, Colorado will provide for potential future expansion into other parts of the country. In-N-Out Burger has chosen not to franchise its operations or go public; one reason is the prospect of quality or customer consistency being compromised by excessively rapid business growth. The company's business practices have been noted for employee-centered personnel policies. For example, In-N-Out is one of the few fast food chains in the United States to pay its employees more than state and federally mandated minimum wage guidelines – starting at 14 USD per hour in California, as of July, 2019. The In-N-Out restaurant chain has developed a highly loyal customer base and has been rated as one of the top fast food restaurants in several customer satisfaction surveys.