sentence: Airships stay in the sky by floating.
sentences_before: Airships' are kind of aircraft.
sentences_after: This is different from aeroplanes that stay in the sky by moving. An airship floats like a balloon. But an airship is different from a balloon. An airship has an engine for power and a way to control its direction of movement. A balloon does not have an engine or a way to control its direction of movement.
concept_name: airship
headings: Airship
categories: Aircraft