That massive size and slowness and expensive material and depleting helium can only haul 8,000 pounds beyond its crew. For comparison, the most common passenger jet there is; the Boeing 737 can haul around like 50,000 pounds depending on how much fuel is on board.

It’s a cool concept, but I can’t fathom it ever doing a whole lot of good. The more carbon neutral appropriate thing to do that would be a viable option would be for jets to use a different fuel source. Maybe massive solar arrays at airports used to create liquid hydrogen and craft designed to run on that instead of jet fuel. I don’t really know myself, but I know there’s no way anything other than very niche scenarios will crazy huge expensive zeppelins be used.