In one of the scariest stories of the year: By 2047 the Air Force says unmanned aircraft with blazing artificial intelligence systems could fly over a target and determine whether to unleash lethal weapons - without human intervention. Such intelligent unmanned aircraft were described in the Air Force's wide-ranging "Unmanned Aircraft Systems Flight Plan 2009-2047" report which outlines the service's future use of drones. The report details major new responsibilities for unmanned aircraft from the ability to refuel other aircraft to the capacity to swarm multiple drones on a single target. And of course the capability to attack enemy targets on its own.