How are modern airships used nowadays?
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In 1997 the Zeppelin NT, which uses modern technologies and design innovations to realize a more maneuverable and efficient semirigid airship, made its maiden flight and testing began in the hope of putting airships into commercial service once again. Several have been built; they are usually flown in a slightly heavier-than-air condition and use engine power to attain lift. The airships began tourist flights over Lake Constance in 2001. All of the other airships flying today are of the nonrigid variety. No nonrigid airships are used to carry passengers or cargo; they serve a number of utilitarian functions such as military surveillance, flashing advertising messages, and providing "bird's eye" television images of sporting events.
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