Maybe it's their connection to Steampunk fiction or Pulp adventure. Maybe it's that the presence of airships is one of the key indicators that you're in an alternate time-line. But I love airships. Since college, I've mulled the idea of reviving the concept of an airship cruise line. We've had plenty of time for stigma of the Hindenburg to fade away. The time is right for such an enterprise. Apparently, someone else has the same idea.
On a related note, I found this site to be a fantastic reference for information on historical airships (British airships, specifically).