Please answer the following question: Information: - Denver International Airport , often referred to as DIA, is an airport in Denver, Colorado, United States. At 33,531 acres (52.4 sq mi), it is the largest airport in the United States by total land area. Runway 16R/34L, with a length of , is the longest public use runway in the United States. As of 2015, DEN was the 18th-busiest airport in the world and the 6th busiest in the United States by passenger traffic with over 54 million passengers. It also has the third largest domestic connection network in the country. The airport features 133 gates spread out over three detached, yet internally connected, linear concourses (A, B & C). - Great Lakes Airlines, is an American regional airline operating domestic scheduled and charter services. Corporate headquarters are in Cheyenne, Wyoming, with a hub at Denver International Airport. - Midwest Connect was the brand name for the regional airline service of Midwest Airlines , rather than a certificated airline carrier . Skyway Airlines was the sole operator of Midwest Connect since its inception in 1989 , until SkyWest Airlines began additional Midwest Connect service on April 1 , 2007 . SkyWest took over all Midwest Connect operations following Skyway 's shutdown of operations on April 5 , 2008 . In October , 2008 , Republic Airlines also began operating for Midwest Connect . On November 3 , 2009 the Embraer 170 and Embraer 190 operated by Republic Airlines were rebranded as Midwest Airlines operated by Republic Airlines . Later , during Midwest 's merger with Frontier Airlines under the ownership of Republic , Chautauqua Airlines oprerated as Midwest Connect . - Frontier Airlines is a United States ultra low cost carrier headquartered in Denver, Colorado, USA. The carrier, which is a subsidiary and operating brand of Indigo Partners, LLC, operates flights to 54 destinations throughout the United States and 5 international destinations. The airline maintains a hub at Denver International Airport with numerous focus cities across the United States. Also, under a code-share agreement with Great Lakes Airlines, the airline connects passengers to surrounding Rocky Mountain States through their Denver hub. - United Express is the brand name for the regional branch of United Airlines, under which nine individually owned regional airlines operate short and medium haul feeder flights. - Skyway Airlines was an American ramp and aircraft ground handling services and catering company based in Oak Creek, Wisconsin. Until April 5, 2008, it operated as a regional airline and banner carrier exclusively for Midwest (Express) Airlines under the business name Midwest Connect, feeding Midwest's hub at General Mitchell International Airport with twelve 32-seat Fairchild-Dornier 328JET jet aircraft, and four 19-seat Beechcraft 1900 turboprops. Skyway Airlines, along with its parent corporation, Midwest Air Group, has ceased operations. - SkyWest Airlines is a North American airline owned by SkyWest, Inc. and headquartered in St. George, Utah, U.S.. Financially speaking and according to the Airlines for America definitions, SkyWest is a North American major airline. SkyWest however, operates on a regional airline level and is a member of the Regional Airline Association. SkyWest Airlines flies to 203 cities, in 43 states; five Canadian provinces and five cities in Mexico and the Bahamas. The airline serves as a feeder airline, operating under contract with various major carriers. It flies as SkyWest Airlines in a partnership with Alaska Airlines, as United Express on behalf of United Airlines, as American Eagle on behalf of American Airlines, and as Delta Connection on behalf of Delta Air Lines. - Alaska Airlines is an American airline based in the Seattle metropolitan area of the state of Washington. The company was founded in 1932 as McGee Airways, offering flights from Anchorage, Alaska. Alaska Airlines has flights to more than one hundred destinations in the contiguous United States, Alaska, Hawaii, Canada, Costa Rica and Mexico. The airline is a major air carrier and, along with its sister airlines Horizon Air, and Virgin America, is part of the Alaska Air Group. The airline has been ranked by J. D. Power and Associates as having the highest customer satisfaction of the traditional airlines for nine consecutive years. - Midwest Airlines (formerly Midwest Express) was a U.S.-based airline and, for a short time, an operating brand of Republic Airways Holdings based in Oak Creek, Wisconsin, operating from Milwaukee's General Mitchell International Airport. On April 13, 2010, parent company Republic announced that Midwest Airlines and Frontier Airlines would merge, with the Midwest brand disappearing in late 2011. - General Mitchell International Airport is a civil-military airport five miles (8km) south of downtown Milwaukee, Wisconsin, United States. It is included in the Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 20172021, in which it is categorized as a medium-hub primary commercial service facility. What is the relationship between 'midwest connect' and 'general mitchell international airport'?
A:
airline hub