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There are two types of air-craft: Heavier-than-air and lighter-than-air.
Lighter-than-air craft are things like zepplins and balloons that, due to the gas inside actually weigh less than air, and so float upwards.
Heavier-than-air craft are basically everything else. Airplanes and the like are not able to float on air and require some sort of thrust and lift system to get them airborn.
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