The G550, which just a few years ago was the most capable bizjet in the world, boasts a range of 6,750 nm at Mach 0.80, while the G600 will be a 6,200 nm airplane at Mach 0.85. So while not as rangy as the 550, it will cover its ground faster. Moreover, at its normal high-speed cruise of Mach 0.90, it will be a 4,800 nm airplane. It's also a more technologically advanced model in numerous ways. Gulfstream stresses that the G650 and G650ER are still its flagship models, and with their enormous range and comfort, as well as their hefty price tags, it's hard to argue that fact.