What I really like is that the signs say they don't retain the image for more than a certain amount of time. Yes, most definitely the TSA does not retain it. But the Five eyes surveillance scheme? You can bet they do.
…unless you’re not a US citizen, in which cases we retain the image forever. You can’t opt out.
[1] https://www.cbp.gov/about/congressional-resources/testimony/... [2] https://www.cbp.gov/sites/default/files/assets/documents/202...