The Cessna Citation X is a long-range medium business jet aircraft. The Citation X is powered by two Rolls-Royce turbofan engines and is built by the Cessna Aircraft Company in Wichita, Kansas. The Citation brand of business jets encompasses six distinct "families" of aircraft.  Although based on the earlier Citation III, VI and VII models, the Citation X is significantly different, with a totally new wing design, engines, and features a glass cockpit. The Citation X is an upgraded model with improved engines and avionics.