Cities in flight

Hello!

	Has anyone ever designed something similar to the "Cities in Flight"
vehicles?  I've been searching for a little while and I'm a bit surprised
to see that no-one has done it, considering the many references in Traveller
to Blish' books.

	So... Anyone?  Scott Kellog? :)  If someone has done them already,
any pointers?

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Pierre-Louis Constantin, [email removed]