Zeppelins were historically important for air travel before airplanes became dominant. Before the era of commercial jets, the zeppelin was a marvel of aviation history.
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Negative Association
The word may evoke memories of the Hindenburg disaster, affecting its modern use. Whenever people mention a zeppelin, I recall the tragic Hindenburg incident.
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Cultural References
Zeppelins often appear in steampunk genres and historical stories or films. The steampunk novel featured a zeppelin as the main mode of transportation.