"Oh, well- we still have mail. I mean, some things have to be conveyed privately, you know? And stuff has to be done officially so that there's a permanent record- even with sound recording you don't really have something as permanent as a piece of paper. But it's great for stuff like coordinating fleet movement at a distance. Heck- modern airports can bring in a guy in an airplane without him being able to see what he's doing, using the right kind of radio signals so that he can tell where the runway is. It's amazing stuff."