Airways' United Express Denver hub, routes, and assets, and negotiated a codeshare agreement with United Airlines. Using these newly acquired routes, Mesa set up a Denver hub flying as United Express. Aspen Airways' BAe 146 and Convair 580 aircraft and its Denver-Aspen route were sold to Air Wisconsin. Mesa had many changes in 1991; acquiring Air Midwest, its Kansas City hub and a codeshare agreement with USAir Express in July, starting FloridaGulf Airlines serving Florida, South Carolina, Georgia, Alabama, Arkansas, and Louisiana from its Tampa hub under a USAir Express codeshare in December. It was also in talks to acquire WestAir Commuter Airlines. In 1992, Mesa completed acquisition of WestAir Commuter Airlines and its hubs in San Francisco, Los Angeles, Portland, and Seattle as well as its United codeshare. In October 1992, Mesa negotiated a codeshare agreement with America West for its Phoenix hub to be operated as America West Express. In 1993, Mesa's codeshare with Midwest Express expired. Midwest Express kept the name Skyway for its future regional of the same name. Using the aircraft from the former Skyway operation, Mesa established Superior Airlines with a Columbus hub operating as America West Express. Mesa created CalPac (California Pacific) with a Los Angeles hub operating as United Express. Both Superior and CalPac were short-lived operations, with both airlines being folded back into Mesa Airlines United Express operations. In 1994, Mesa acquired Pittsburgh-based Crown Airways. Using the assets from Crown Airways, Mesa set up Liberty Express Airlines with a Pittsburgh hub operating as USAir Express. In March 1995, Mesa took delivery of its first two regional jets, the Fokker 70, a smaller version of the Fokker 100 jetliner. Mesa created Desert Sun Airlines and operated the two jets from a Phoenix hub to Des Moines and Spokane as America West Express. Reorganization As Mesa acquired air carriers or expanded by creating new airlines, it grew in a seemingly haphazard manner. From 1989 through 1995, Mesa had grown from one airline with hubs in Albuquerque, Denver, and Phoenix to six separate airlines with hubs throughout the country, though it had as many as eight airlines prior to 1995. Rather than integrating each new acquisition and airline into one integrated company, Mesa continued operating each individual airline independently, with separate labor groups, separate flight, maintenance, and marketing operations, and separate codeshare agreements. This resulted in an unwieldy corporate structure. In 1992, Mesa created