““But seat-back video screens and the hard frames that surround them pose a safety challenge, partly because of the potential for injuries caused by head strikes, and partly because the computers and the electrical systems that serve them have to be both fireproof and fully isolated from the plane’s—so that crossed wires in somebody’s seat don’t allow a ten-year-old playing a video game to suddenly take control of the cockpit. Largely as a result, in-flight entertainment systems are almost unbelievably expensive. The rule of thumb, I was told, is “a thousand dollars an inch”—meaning that the small screen in the back of each economy seat can cost an airline ten thousand dollars, plus a few thousand for its handheld controller.””
