CCTV cameras are bringing more and more public places under surveillance – and passenger aircraft could be next.

A prototype European system uses multiple cameras and "Big Brother" software to try and automatically detect terrorists or other dangers caused by passengers.

The European Union's Security of Aircraft in the Future European Environment (SAFEE) project uses a camera in every passenger's seat, with six wide-angle cameras to survey the aisles. Software then analyses the footage to detect developing terrorist activity or "air-rage" incidents, by tracking passengers' facial expressions.

The system performed well in tests this January that simulated terrorist and unruly passenger behaviour scenarios in a fake Airbus A380 fuselage, say the researchers that built it.

Systems to analyse CCTV footage – for example, to detect violence (with video) or alert CCTV operators to unusual events – have been designed before. But the SAFEE software must cope with the particularly challenging environment of a full aircraft cabin.