The system would replace passport-scanning SmartGates, which were implemented in the nation just ten years ago. The government's plan to implement biometrics might be a touch ambitious, however. It still doesn't have an actual solution in place yet, so has started seeking bids from companies "to provide innovative solutions to allow arriving travelers to self-process," a spokesperson for the Department of Immigration and Border Protection (DIBP) said.

Though it sounds far-fetched to process 90 percent of passengers without having a system in place, the DIBP said it already hits some of those goals using SmartGates. Coyne said that in one possible implementation, passengers would be shunted through corridors and their biometrics checked, without the need to even stop. Biometrics scanners are being tested at some US airports, but only as a way to confirm passport identities.

A passenger at Grand Central Station performs an iris scan to qualify for a Clear Pass (James Leynse/Corbis via Getty Images)

Presumably, passengers would accede to having their biometrics captured and stored together with identifying information, something that raises privacy and security concerns. Like anywhere, government organizations in Australia are not immune to security hacks, for instance, and it would be a huge headache if thieves stole not just identities but iris scans and fingerprints. Facial recognition is also controversial and has led to wrongful convictions, racial profiling and other issues.

However, the Australian government ran the idea past its privacy commission and passed a law in 2015 allowing it to collect more biometric data from citizens and foreigners, including minors, at its airports. That data includes fingerprints, photos, audio, video, iris scans, fingerprints and your height and weight. It plans to start biometric trials in July at a small feeder airport in Canberra, and implement it at all international airports by March, 2019.