We've been here before...
Airship Industrie
Remember this one from the '80s? I certainly do as one of its last gasps was to market the dirigible as a "flying billboard" - to which I supplied some DC powered signal processing equipment I designed. The concept of "Certificate of Compliance" (new to me) brought me out in hives.
Every time someone revives the airship idea the same benefits are recounted but does anyone really know how to evaluate whether these things really are an economically viable proposition. Heavy lift in military applications? If they are viable you'd have thought the military would be the first customers.