Drones are transforming our world. We use them to deliver our medicines, clean our skyscrapers and even fight fires. But there is a dark side to this airborne revolution, from a shocking rise in drone-plane near misses above our heads to last year's sustained drone disruption at Gatwick – Britain's second largest airport – that ruined the Christmas plans of 140,000 people and cost millions.In this documentary, high-risk specialist and former Royal Marine Aldo Kane sets out to investigate the scale of the threat drones pose to our airports and skies – from rogue hobbyists to determined terrorist attacks. He explores what technologies are out there that governments and the aviation industry can turn to, to keep our skies safe.