Been working on the possible logistics. Could be just 1 person. Unlikely though as there's been some night operations. I'm guessing there's a number of drones, all located in different places, all ready to fly, possibly hidden on the roofs of buildings close by. If they're blue-tooth operated they will have been previously paired with their own individual hand-held controllers to ensure they're not affected by interceptor techniques. One or more guys are watching the airfield from a vantage point, possibly inside the airport itself. The drones will have a maximum fly-time of about 30 minutes. Once each drone has been used, it will be sacrificed along with it's hand-held controller. Another will then be selected when airfield activity is seen to be resuming. The problems will continue until the culprit is discovered or he runs out of drones. Shooting down a drone won't help the problem.