The normal TSA pre-check lines make you scan your face too. They used to read "images are deleted after use" but I didn't notice that message last time I went through security. So likely it's being used by ICE now.

The customs line have been doing much more rigorous face scanning for a while now.

TSA allowed to opt-out of this photo the last time I flew. You may also opt-out of the body scan. Nobody does.

I have a bridge to sell anyone who thinks those are deleted after use.

I bet the airports are additionally recording gait using overhead cameras.