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.