Boeing announced that its A-160 Turbine (A-160T) Hummingbird unmanned rotorcraft has achieved two key milestones: using its two-speed transmission to change gears in flight, and passing the 100-flight-hour threshold. Breaking the 100-flight-hour mark shows how much the A-160T has matured since its first flight in June 2007. That first 12-minute flight set the stage for multiple endurance flights,...