Manufacturing on demand approaches.
World's first 'printed' airplane takes to the skies | ZDNet: "The plane, called SULSA (Southampton University Laser Sintered Aircraft), was printed on an EOS EOSINT P730 nylon laser sintering machine, which fabricates plastic or metal objects, building up the item layer by layer."
...Because no tooling is required for manufacture, radical changes to the shape and scale of the aircraft can be made with no extra cost.
