London Telegraph 
June 7, 2011
A prototype of the new technology was unveiled in Singapore yesterday by the International Air Transport Association (IATA), which represents the world’s major airlines.
It features screening methods which are either already commonplace at airports – such as body scanners – and those which are expected to be introduced soon, including liquid detectors.
The IATA system would divide passengers into three categories, who would initially be identified by an iris-recognition system before entering the arches.
So-called “known travellers” who have been pre-screened would only face an x-ray, metal and liquid detector.
“Normal travellers” would also have their shoes scanned automatically and pass through an explosive trace detector.
Anyone whose behaviour raised concern – such as a passenger buying a one way ticket in cash – would go through a different channel which would also feature a full body scanner.