https://www.theverge.com/2018/9/20/17884476/facial-recognition-scan-delta-flight-atlanta-international-airport

Delta will soon use facial recognition for international flights at the Hartsfield-Jackson Atlanta International Airport later this year. Biometric face scanning will be optional, meant as an option to save travelers time from checking in, as spotted by TechCrunch.

Those who don’t want their faces scanned could always opt out, but the option is only given to US citizens. Visitors will need to be scanned as a security measure. The data will be collected and stored for two weeks, although exit records will last for over a decade for citizens and green card holders, and over seven decades for visitors.