Drone threat a steep learning curve for airport chiefs

Aviation chiefs are going to be on a steep learning curve to counter the security threat posed by drones after a costly and humiliating shutdown of London's Gatwick airport."This kind of incident is unprecedented anywhere in the world, the disruption of an airport in this way," Britain's Transport Secretary Chris Graylingsaid Friday.Flights were suspended again at Gatwick on Friday by a drone alert, just hours after being reopened following the originalunmanned drown sightings which caused trave