Sydney Airport's international terminal will begin trials of biometric boarding in May.Sydney Airport's new chief executive, Geoff Culbert, said this week that biometric processing had the potential to revolutionise the journey for passengers through the airport.By the end of the year, Qantas passengers who want to be part of the trial will be able to pass through the six steps of check in, bag drop, border processing, security screening, airport lounge and boarding gate after showing their passport only once for verification.If successful, the airport expects to quickly extend it to other airlines.The introduction of facial-recognition technology at electronic gates in recent years has reduced the average amount of time people using it spend passing through Customs from about 4 minutes to 23 seconds.Passengers wanting to be part of the trial will need to register with the Australian Border Force once it begins in May. Details about exactly what information, such as photographs that passengers will need to provide, are yet to be revealed.”It will make the travel process so much easier for customers,” Mr Culbert said. “You can check in for your flight at home on the couch using facial-recognition technology using your smartphone.”The airport would ensure that “relevant privacy issues are managed”.