The firm expanded internationally during the 1950s, opening plants in Mexico, Germany and the United Kingdom. It began operations in 17 more foreign locations in the 1960s.[citation needed] The company formed Midwest Express Airlines from its corporate flight department in 1984. Kimberly-Clark's headquarters moved from Neenah, Wisconsin to Irving, Texas the following year.[9] Under the leadership of Darwin Smith as CEO from 1971 to 1991, company went from being a business paper company to a consumer paper products company