While it may or may not be infeasible, it is entirely possible to determine the source of a radio signal. It is also possible to overlay that tech on a camera feed so that you get a composite image showing like, someone standing in the airport & their Bluetooth info above their head.

I would not find it surprising if I learned that a system like this already existed in many airports. I mean now with AI the whole thing could be automated if you don't care about a few egregious errors here and there.