At least in the US, isn’t the stored biometric data just a JPEG of the person’s face? In that sense, a photograph should suffice to reproduce it :) If the inte

At least in the US, isn’t the stored biometric data just a JPEG of the person’s face? In that sense, a photograph should suffice to reproduce it :) If the intention is in fact to communicate some fact about the passenger to other parties in the travel sector, it does seem like it might make sense to disambiguate the passenger you’re talking about by specifying their gender and date of birth, and for that matter a stable state-issued identifier. I am curious about what kind of headaches a passport document number could cause, though. I hear people worry about it a lot, but also I’m accustomed to places of public accommodation routinely scribbling the document number down at check-in, or photocopying the document themselves. Is the threat, like, a false visa application or something? Is it the birthday that people are worried about getting out there?