Zeppelin Comeback

Interesting story about a boom in airship construction. I hope these people realize that Helium on Earth is produced as byproduct of petroleum drilling..If the return to airships is an effort to escape oil dependance we need to look somewhere else.
A blimp is shaped by the gas inside of it, whereas a zeppelin has a rigid skeleton inside. The helium-filled sky balloons, or aerostats, used over Afghanistan are neither blimps nor zeppelins. But they all fall under the term “airship.”