On the dirigible airship side, they will likely be short-haul. Mining companies might operate them, that sort of thing. They're slow, at this point, 70 knots. You're not going to have one coming up from the south to the north, but perhaps it will be from a hub centre where they would take supplies a short distance, 70 to 100 miles, whatever. I know Boeing and Lockheed are looking at developing those types of aircraft now.
In the next 40 years you're going to have more composite body aircraft flying, and there's going to have to be some method of ensuring they're safe when they're operating off the runways they're using.