Passenger airplanes could be increasingly at risk of cyber attack and commercial drone strikes, according to the German insurance giant Allianz.
Measuring the scale of the threats posed is challenging for a variety of reasons but Allianz is apparently worried by the increasing reliance of airlines on digital technology and computerised systems.
The major worry is that even the safest of planes might be taken over by hackers who manage to navigate beyond airline security systems.
In a recently published review of aviation, Allianz became the first insurer to publicly express concern about the issue.
"Cyber terrorism may replace the hijacker and bomber and become the weapon of choice on attacks against the aviation community," it said.
Meanwhile, on the subject of commercial drones, Allianz said: "The potential risks are obvious, namely collision or third-party damage or injury and resulting liability."