https://phys.org/news/2018-09-delta-facial-recognition-atlanta-international.html > Atlanta-based Delta says international travelers flying on Delta between Atlanta and other countries can use facial recognition instead of their passports to get through those checkpoints at the airport. > It's similar to what has been launched at other airports globally, including a biometric terminal opened last fall at Singapore Changi airport. Other airlines have also tested the use of biometrics at other airports.