When a device passes the beacons, its non-personal unique ID—called a MAC address—is recorded, encrypted and time-stamped. Blip, you make me laugh. You know this will raise privacy concerns and say the sweet nothings that placate the general public, but inspire no confidence in people who know what those words mean. I'm not here to say that as a JFK traveler I'm unhappy with the privacy considerations. I just want to…
I think the idea is a great one, it's unfortunate there isn't a better way (that I can think of atm) to do it, or like you said just some transparency on what they do with it. As simple as: "At the end of each day the encrypted mac addresses are completely erased from our system."
Seems like they do keep the info though, it says the Cincinnati airport kept it and used it for data analysis. In the end, I think this kind of thing most people will be okay with foregoing a bit of privacy for.
Edit: Interesting article on mobile MAC addresses down the comments: https://news.ycombinator.com/item?id=10097882#up_10098108