Uber just celebrated its two-billionth trip in a 147-way tie, according to CEO Travis Kalanick, who shared the information in a Monday post on Facebook. Each of the drivers and riders who began their trip at 4:16 a.m. GMT on Saturday, June 18, got a $450 gift from Uber -- the number is significant because Uber now operates in 450 cities across the globe, Kalanick said. The company's growth trajectory is impressive. It took five years for Uber to notch its first billion, the CEO noted, but just another six months to hit the 2-billion ride mark.