This whole
Airships To The Rescue thing may be pie in the sky.
The critical path/element of course is helium.
In commercially meaningful quantities, it comes from just one place on earth...
Texas.
The issue being that we may be at or beyond "Peak Helium."
For real!
In my own direct experience, in the last 3 years the cost of helium has about doubled.
Then there's the relatively easy to make hydrogen, even lighter than helium...