Midwest Airlines was an American airline that operated from 1948 to 2010. It was originally known as Midwest Express and was famous for its premium service and signature freshly baked chocolate chip cookies served on board. Midwest Airlines primarily served destinations in the Midwest region of the United States, with its main hub at General Mitchell International Airport in Milwaukee, Wisconsin. The airline had a small fleet of McDonnell Douglas MD-80 series aircraft. In 2009, Midwest Airlines merged with Frontier Airlines, and the Midwest Airlines brand was subsequently discontinued in 2010.