Bombardier introduced its Challenger 604 in 1995 as a major upgrade on the Challenger 601 design.
Challenger 604 has advanced GE CF34-3B engines; increased fuel capacity including saddle tanks in the rear of the aircraft; new undercarriage for a higher takeoff and landing weight; structural improvements to wings and tail; and a new Rockwell Collins ProLine 4 avionics system.
The Challenger 604’s cabin is very similar to its predecessor’s, 601-3A and -3R. The Challenger 604’s cabin has extremely low noise levels. It is normally configured with 10 – 12 passengers in a double-club or a forward club/half club/divan arrangement and includes a deluxe galley and lavatory.