> I'm really curious how dystopian we actually are

No idea how widespread it is, but in Singapore airport the system is tightly integrated. You are "tagged" when you check in, and "tagged out" as you board, with your appearance associated with your intended flight details. If you miss your flight or otherwise spend too much time in the secure zone, you are highlighted in the system and will eventually be approached. Arriving passengers are also given a time limit to take their next action, be it clear immigration or enter transit, and lingering will also trigger a response.

All in the name of safety and security but I can't help but feel a measure of discomfort with it all.