I saw something earlier today that said KDIA has a 53 square mile footprint. It's bigger than some cities and it was built away from people on purpose so wildlife would be an issue, not to mention it's supposed to be a secure area so tall fences and thermal cameras don't seem far fetched. It's almost 25 miles of fence line to monitor and secure. People are smart and where there's a will there's a way. I'm unsure of a better option unless you want to create a DMZ around airports with manned gun towers to disable trespassers? I'm unsure if that video is even authentic, it's hard to tell what's real and what isn't these days.