Wichita is a city in and the county seat of Sedgwick County, Kansas, United States. As of the 2000 census its population was 344,284. The 2008 estimated population of 366,046 made it the 51st largest city in the country and the most populous city in Kansas. Wichita is located in south central Kansas on the Arkansas River. The city was incorporated in 1870, based on the success of businessmen who came to hunt and trade with native populations. Its position on the Chisholm Trail made it a destination for cattle drives headed north to access railroads to eastern markets. In the 20th century, aircraft pioneers such as Clyde Cessna, Walter Beech and Bill Lear began projects that would lead to Wichita's establishment as the "Air Capital of the World". The aircraft corporations Stearman Aircraft, Cessna, Mooney and Beechcraft were all founded in Wichita in the late 1920s and early 1930s. Cessna and Hawker Beechcraft remain based in Wichita today, along with Learjet and Spirit AeroSystems, and both Airbus and Boeing maintain a workforce in Wichita. Wichita has evolved into a cultural and entertainment center. The downtown district offers nightclubs, restaurants, shopping centers, museums and parks. Intrust Bank Arena, a 15,000 seat arena in the middle of Wichita, opened in January 2010. Several universities are in Wichita, the largest being Wichita State University with an enrollment of 15,000 students. In July 2006, CNN/Money and Money magazine ranked Wichita 9th on its list of the 10 best U.S. big cities in which to live. In 2008, MSN Real Estate ranked Wichita 1st on its list of most affordable cities.