Answer: dirigible

AnswerCrossword Clue
DIRIGIBLEAirship.
DIRIGIBLEHindenburg, for one.
DIRIGIBLEShenandoah, for one
DIRIGIBLETissandier vehicle
DIRIGIBLEIt's lighter than air
DIRIGIBLELighter-than-air aircraft
dirigiblethat can be directed / a dirigible balloon or airship
dirigibleself-propelled, lighter-than-air aircraft; airship