By 
As drone proliferate, both clueless operators and those with criminal intent pose a threat to airports and other critical infrastructure. In April 2019, more than a thousand flights were delayed or cancelled out of London's Gatwick Airport due to drone sightings close to the runway, demonstrating the havoc that can be wreaked by off-the-shelf drones without effective systems to detect and potentially destroy these little quadcopters. John talks with business and homeland security editor Cal Biesecker on progress across the…
