> Nearly every element [of an airplane seat] undergoes a safety-enhancing process called “delethalization”: seats have to withstand an impact equal to sixteen times the force of gravity [and many other constraints] .... 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.
https://www.newyorker.com/magazine/2014/04/21/game-of-throne...