Cessna Citation Service Center is a branch of Cessna Aircraft Company. Based on unit sales, Cessna Aircraft Company is the world's largest manufacturer of general aviation airplanes. In 2005, Cessna delivered 1,157 aircraft and reported revenues of about $3.5 billion. Since the company was originally established in 1927, more than 187,000 Cessna airplanes have been delivered to nearly every country in the world. The global fleet of more than 4,500 Citations is the largest fleet of business jets in the world. In addition to its Citation business jets, the company also features freight and passenger-hauling utility caravans, and personal and small-business single-engine pistons. Cessna Citation Service Center has a location in Milwaukee.