An aircraft prepares to land at London Gatwick Airport after flights resumed following the closing of the airfield due to sightings of drones.
Neither airport would comment on the specific technology they are investing in.
But the Armed Forces were said to "stand ever-ready to assist should a request for support be received".
One of the technologies deployed at Gatwick in December was the Israeli "Drone Dome" system, designed by Rafael and to provide "effective airspace defense against hostile drones" aiming to perform "aerial attacks, collect intelligence, and other intimidating activities".
The system is said to have a range of several miles and uses four radars to give 360-degree detection to identify and track targets.
Ghosn to appear in court for detention hearing
He remains chairman and CEO of Renault , but the company has assigned his duties to other executives in his absence. Former Nissan Chairman Carlos Ghosn is set to appear in a court in Tokyo to hear the reason for his detention.
Yesterday morning Chris Grayling, the transport secretary, hosted a meeting of police, aviation and defence chiefs to discuss lessons that...
Police have not yet found the drone and do not know its model, he said.
Mr York defended the decision to hold Mr Gait for an extended period, despite his employer saying he was at work during the drone flights.
A couple - Paul Gait and Elaine Kirk - who were arrested in nearby Crawley on December 23 were later released without charge by Sussex Police, who were forced to make a grovelling apology after it became clear they were entirely innocent. Mr York added: "I don't think we have found the drone responsible for this at this time".
"Just a few months ago we would not even have dreamed of being able to acquire an unlimited licence in the London airports system for less than 20 times core earnings", stressed Vinci Airports President Nicholas Notebaert, alluding to Brexit uncertainty as a factor in the deal price.
More than 140,000 passengers at Gatwick were affected during 36 hours of chaos between 19 and 21 December.