Aerostat
From wiki.flightgear.org
The word aerostat was originally French and is derived from the greek aer (air) + statos (standing). An aerostat is a lighter than air object that can stay stationary in the air. Aerostats include free balloons, airships, moored balloons and tethered Helikites. Such a vehicle consists of a lightweight skin filled with a lifting gas to create buoyancy.
These aircraft take advantage of lighter than air gas to become buoyant. In addition to typical aircraft control methods such as elevator, rudder and engine throttle, ballast and control of gas volume and pressure become options.
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