There's your nationality inside. Place of birth, and some countries take that in account for visa purposes.
I'm exempt of Colombia/Costa Rica visa for example, my friend has also RTD and needs visa because he's from Nicaragua.
Our first international travel, He was also treated differently at Mexican immigration by the same agent when they saw NIC. LOTS of questions. When I passed first, they just asked where are you coming from? - Canada. Stamped.
My friend couldn't even do the online check in at flair when putting Nicaragua, he then put Canadian went to the next screen, but an error appeared telling him to go to desk.
Mine worked and showed the seat number but also told me to go to the desk.