Balloon

From Srafopedia

A balloon is a type of aircraft that remains aloft due to its buoyancy. A balloon travels by moving with the wind. It is distinct from an airship, which is a buoyant aircraft that can be propelled through the air in a controlled manner. In His Dark Materials, Lee Scoresby, the [[aëronaut] used his balloon on multiple occasions, such as the battle at Bolvangar.