4 relations: Airship, Helium, Surveillance aircraft, Unmanned aerial vehicle.
Airship
An airship or dirigible balloon is a type of aerostat or lighter-than-air aircraft that can navigate through the air under its own power.
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Helium
Helium (from lit) is a chemical element with symbol He and atomic number 2.
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Surveillance aircraft
A surveillance aircraft is an aircraft used for surveillance—collecting information over time.
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Unmanned aerial vehicle
An unmanned aerial vehicle (UAV), commonly known as a drone, is an aircraft without a human pilot aboard.
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