Goodyear bids goodbye to blimps, says hello to zeppelins
news.cnet.com
news.cnet.com
http://www.airships.net/dirigible
A zeppelin is a rigid airship manufactured by a particular company [...] A blimp (technically called a “pressure airship”) is a powered, steerable, lighter-than-air vehicle whose shape is maintained by the pressure of the gases within its envelope. A blimp has no rigid internal structure; if a blimp deflates, it loses its shape.
The fact that they're considering zeppelins leads me to believe that the normal procedure is to fly them to events, which seems crazy given how slow they appear to be...
As far as speed goes, they can keep a constant AIR speed, they don't get caught in traffic jams or anything like that.
From the FAQ: The usual cruising speed is thirty-five miles per hour in a zero wind condition; all-out top speed is fifty-three miles per hour on the GZ20. As to cruising range: the ship can carry enough fuel to fly for twenty- four hours, although it rarely does so. When traveling cross-country the blimps fly wherever they go, and the crews try for an eight-hour day, or about 300 air miles.