According to the official Royal Australian Air Force website, the Challenger CL-604 is a derivative of the Challenger 600 which has been progressively updated to improve range, performance and reliability and fitted with a high-tech wing, high bypass CF34-3B engines and a Rockwell Collins ProLine 4 ‘glass cockpit’.
Additionally, the aircraft are crewed by three personnel consisting of a pilot, co-pilot & an attendant and configured to accommodate upto nine passengers.