lighter-than-air aircraft

generate a one-sentence description for a given conceptual class.
# Response Format
Return only the sentence: "Description: [one-sentence description of the conceptional class]"

Class: lighter-than-air aircraft

A lighter-than-air aircraft is a vehicle that achieves flight by being buoyant in the air, typically through the use of gases less dense than the surrounding atmosphere, such as helium or hot air.