As long as we're nitpicking terminology, hot air balloons aren't airships either, they're aerostats. And they certainly don't use their variable bouyancy to pro

As long as we're nitpicking terminology, hot air balloons aren't airships either, they're aerostats. And they certainly don't use their variable bouyancy to propel themselves in directed flight. Saying this thing is just a hot air balloon is like saying an airplane is just a glider.