Aerostat
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An aerostat or lighter-than-air aircraft is an aircraft that relies on buoyancy to maintain flight. Aerostats include unpowered balloons and powered airships.
A modern aerostat used by the U.S. Department of Homeland Security, the Tethered Aerostat Radar System (TARS)
A free-flying hot air balloon
The Goodyear blimps are non-rigid airships.
The Tethered Aerostat Radar System is an American low-level airborne ground surveillance system that uses aerostats as radar platforms. Similar systems include the EL/M-2083 and JLENS.
Aerostat
…A modern aerostat used by the U.S. Department of Homeland Security, the Tethered Aerostat Radar System (TARS) An aerostat (from Ancient Greek ἀήρ (aḗr) 'air' and στατός (statós) 'standing', via French) or lighter-than-air aircraft is an aircraft that…
The underside of a tactical Aerostat
Tethered Aerostat Radar System in New Mexico
The Aerostat ship Atlantic Sentry at Mallory dock in Key West in September 1987