Yes, indeed they are. Though seldom used in the modern era, aside from the occasional blimp; airships, especially the Zeppelin, were a very popular mode of transportation between the late nineteenth and mid twentieth centuries.
The most famous airships are Hendenburg and Zeppelin.
Airships do use gas, to provide lift.
Airships are usually the shape of a oval. They look like blimps. Airships are usually filled with helium to keep them afloat.
the gas that helps airships is i hate you wikianswers.com
Hydrogen used to be used in airships.
Curly's Airships was created on 2000-10-05.
gas is still used in airships to provide lift.
Hydrogen and helium are two elements that are kinda-sorta interchangeable in airships.
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Hayao Miyazaki has featured airships in several of his films, including Nausicaa of the Valley of the Wind and Castle in the sky. You can also find airships in Howl's moving castle. Here is a website on some anime with airships: http://animeworld.com/related/airships.html Also, here is a website with a lot of other movies with airships: http://spot.colorado.edu/~dziadeck/airship/films.htm
Hydrogen was once used to fill airships. Quite dangerous due to how flammable it is.
Modern airships use Helium for lift which is non-combustible whereas in the past airships such as the Hindenburg used Hydrogen for lift which is highly combustible. In addition, modern airships take advantage of new alloys and polymers which give them a much stronger airframe.