Futuristic eye scanners are the latest technology at one of the world's busiest airports.
A new identity system is to be tested at London's Heathrow which examines passengers' eyes instead of their passports.
Two thousand regular travellers from North America will have a picture of one eye stored on a computer.
When they arrive in the UK they'll go into a special booth where a camera will compare the iris of their eye with the one on file.
The iris - the part around the pupil - is as unique as a fingerprint.
The new technology should take about two seconds before a barrier opens automatically.
Heathrow is the first UK airport to carry out a large-scale trial of the iris recognition technology.
It's hoped it'll make going through immigration control faster.