Topic summaryLighter-than-air aircraft Expand Summary Extracted from the Wikipedia article Aerostat. An aerostat (from Ancient Greek ἀήρ (aḗr) 'air' and στατός (statós) 'standing', via French) or lighter-than-air aircraft is an aircraft that relies on buoyancy to maintain flight. Aerostats include unpowered balloons (free-flying or tethered) and poweredairships. Wikipedia source
