Complete with a very good explanation of network routing. Basically, he was able to track his flight by watching the BGP updates. A bit wasteful (each aircraft has a C-Block (CIDR /24), which it announces via good old-fashioned BGP), but definitely better than a centralized access exchange and a bunch of traffic being shipped there (cranking the latency up as you get further from the company's exchange).
I'm not crazy about the fact that each aircraft is NAT'd (each one is a flying C-Block, why not give everyone a public address for the flight? (YES I KNOW there are good reasons not to, so STFU. I'm just bitter because I'd like a routable address!)
Go read it, check out below for more of my thoughts.