The Cessna Citation X is a super mid-size jet which received it's FAA type certification in 1996. It was a large competitor to the Gulfstream G650. With that being said, the Citation X had completed another upgrade in 2014, which turned out to be the Citation X+. This pushed its maximum cruise speed to Mach 0.935, along with additional upgrades to range, avionics, winglets and more.