Obviously that's a huge advantage with fog.
I can remember my son being in a hockey tournament up in northern B.C. and being stuck up there for several days as a result of fog. So there's a great example of an advantage, for sure.
Compared to air traffic or your other options, like ice roads or whatever other options there might be that could be developed, can you tell me some more advantages there might be to airships, what disadvantages there might be, and why those?