Here in Tucson, with the annual golf tournaments around town (Tiger's been here the last two years), I get to see a variety of blimps floating about on a fairly routine basis. Last year, a semi-rigid frame German airship operated out of the regional airport two miles from where I teach, for about a week.
Anyway, it's surprising how fast they get around. I honestly couldn't tell you the average blimp/airship's top speed, but their ability to overfly tricky terrain types (rivers, hills, swamps, etc.) and bypass roads lets them get to places faster than trucks travelling the same distances.
The other thing they've got going for them is that they are extremely quiet. You really don't know they're around until you actually see them coming. Granted, that's not too hard, but they are really quite stealthy, sound-wise.
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