That's the one case where airships will not be affected. Fog will not affect an airship because you can come in and can sit there and come down vertically.
In one of the recent accidents we saw in northwestern Ontario, an airplane came in, he couldn't find the runway, and he ended up crashing on the lake. That was somewhat weather-related, but also pilot error.
In the case of an airship, you never put down that way because you can always put down vertically wherever you're going to go. So the fog isn't the problem the way it is with other things. Other issues may be more limiting, but our view is that they'd be about as useful as airplanes.