Airships

Airships, also known as dirigibles or zeppelins, are lighter-than-air aircraft that stay buoyant using large gas-filled envelopes, typically filled with helium or historically hydrogen. They have a rigid or semi-rigid structure that maintains shape and are powered by engines, allowing controlled movement through the air. Unlike airplanes, airships can hover, glide slowly, and land vertically, making them useful for advertising, surveillance, and tourism. Their ability to remain stationary and operate at low speeds offers distinct advantages, though they are less common today due to advances in airplane technology.