The article mentions a "one to many" system which is exactly this - it compares you to every face in the database and decides who you are, eliminating the need

The article mentions a "one to many" system which is exactly this - it compares you to every face in the database and decides who you are, eliminating the need to show physical ID. Unless both twins are flying on the same day, you could solve this by rejecting matches of people who don't hold a boarding pass for that airport. Or you could just require a physical ID as backup if the system can't return a match (due to identical twins or otherwise).