Article clearly stated that 21st century sphere is made of spectra. Sanswire is made of Kevlar. Look at design of 21st century ship. It's a sphere with man seating inside the sphere.
21ST CENTURY AIRSHIP - made of spectra
SANSWIRE DESIGN - made of Kevlar
In past perhaps they had some sort of relationship but as you see they split in two different directions and two different designs. If you know more about what type of relations they had then please post and back it up with links.
And as Jack always says: "You can't handle the truth! Son"
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