DHS partnered with Delta and JetBlue to introduce facial recognition systems for international flights from US airports. The system will compare the face scan to a passenger’s passport or visa paper photos, and see if they fit the identity of the person recorded on each flight manifest. The DHS, through the CBP, was already collecting fingerprints and photos from foreigners when entering the US since 2004. Congress and the Obama administration approved to expand this biometrics data collection program to include travelers entering and leaving the US, via air, sea, and land.
Source: https://www.bleepingcomputer.com/news/government/dhs-ramps-up-program-to-scan-peoples-faces-when-they-leave-the-us/