The first Citation X was delivered in July 1996 to golfer and long-time Cessna customer Arnold Palmer.--> Once in use, the Citation X continued to set speed records. Arnold Palmer set one of them in September 1997: on a 5,000 km closed course. In February 1997, the Citation X design team was awarded the National Aeronautic Association's Robert J. Collier Trophy.--> The Citation X was approved by Transport Canada on May 22, 1998, and by the European Joint Aviation Authorities in 1999. In October 2000, Cessna announced an upgrade for all Citation Xs to be delivered after January 1, 2002. The main characteristics of this upgraded version are a 5% increase in thrust, a increase in maximum take-off weight and improved Honeywell avionics.