The article focuses on the technical aspects: can it be done. Yes, I'm sure it can be done. But that wouldn't suddenly turn air travel into rail travel.
Think on the differences here for a bit. Air travel security is very tight because of the security risks. As much as some may call it security theater, there are real risks with getting that many people together on an airplane loaded with fuel which can go anywhere. This proposal does nothing to mitigate those security issues, so none of those security precautions common in airports would likely change.