Instead of a Citation IV, Cessna focused their attention on developing two other versions of the III simultaneously. The first of these, the Citation VI, was intended to be an economy version of the III, with a basic, standardized avionics package and a generic cabin interior, without the option of custom interiors that were designed for each customer as was the practice with the III. The first flight of the VI took place in 1991, but the market didn’t respond well. Only 39 aircraft were built before the model was discontinued in May 1995. The second aircraft that Cessna worked on after the cancellation of the IV was the Citation VII, which again was based on the III but intended to take a big step forward in performance. Improved Garrett TFE731-4R engines enabled the aircraft to operate from higher-altitude airfields during hotter weather, when density altitude prohibited operations of the III. First flight of the VII took place in February, 1991, and by the time production ended nine years later, 119 aircraft had been built.