Although the United States used helium, a natural gas which does not burn, its airships, the Akron and Macon, were both lost. They were destroyed by bad weather, the second factor which caused the decline of zep¬pelin-type airships.
Small, nonrigid airships, or blimps, are still used for offshore anti-submarine patrol duty and to explore the edges of space, but large, rigid airships are part of history.
Zeppelins
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