Zeppelins and blimps require a lot of infrastructure to make work -- source of helium or hydrogen and equipment to handle it, hangars (or just mooring masts, though you'll eventually need the ability to hangar for maintenance and such).
It would be a lot for a someone to cobble together in an out of the way spot (like Airlords of the Ozarks), but probably not unreasonable for MilGov, CivGov, or their foreign equivalents to start putting up in the air as rebuilding gets up a head of steam.
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