A test pilot operates a virtual large unmanned aircraft system, or UAS, with simulated air traffic at a NASA research ground control station. The pilot uses the main traffic display for situational awareness. When detect-and-avoid systems notify the pilot that other traffic is too close, he uses a command and control interface to maneuver the aircraft into a safer trajectory. The pilot is connected with a communication head-set where he interacts with air traffic control similar to present-day operations.