Bombardier and Marshall Aerospace and Defense Group have signed a conditional letter of agreement to develop a Future Air Navigation System (FANS) 1/A+ avionics upgrade for the Challenger 604 aircraft. According to Marshall, the upgrade will be designed to enhance pilot to Air Traffic Control (ATC) communications and allow access to dedicated and shorter route FANS 1/A+ to North Atlantic tracks for the 361 Challenger 604’s currently on the market.