ATC
UAVs make progress toward full civil airspace operations
Once the exclusive domain of the military and, with few exceptions, flying outside controlled airspace, unmanned aerial vehicles (UAVs) are now slowly nudg

Once the exclusive domain of the military and, with few exceptions, flying outside controlled airspace, unmanned aerial vehicles (UAVs) are now slowly nudging their noses under the civil tent. Already, USAF RQ-4 Global Hawks routinely fly across the U.S. on their way to undisclosed overseas destinations, but they pose little threat of conflict since they cruise above FL650 and get up there using a steep spiral climb over Nellis AFB in California.