#lighter-than-air_craft  aircraft supported by its own buoyancy
  supertype:  #aircraft  a vehicle that can fly
  subtype:  #airship__dirigible  a steerable self-propelled airship
     subtype:  #barrage_balloon__barrageballoon  an elongated tethered balloon or blimp with cables or net suspended from it to deter enemy planes that are flying low
        subtype:  #kite_balloon  a barrage balloon with lobes at one end that keep it headed into the wind
     subtype:  #blimp__sausage_balloon__sausageballoon__sausage  a small nonrigid airship used for observation or as a barrage balloon
     subtype:  #zeppelin__Graf_Zeppelin  a large rigid dirigible designed to carry passengers or bombs
  subtype:  #balloon  large tough non-rigid bag filled with gas or hot air
     subtype:  #hot-air_balloon__hotairballoon  balloon for travel through the air in a basket suspended below a large bag of heated air
     subtype:  #meteorological_balloon  a small unmanned balloon set aloft to observe atmospheric conditions
        subtype:  #pilot_balloon__pilotballoon  meteorological balloon used to observe air currents
     subtype:  #trial_balloon.balloon__trialballoon  a balloon sent up to test air currents

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