Israel Air Forces’ Aerial Maintenance Unit is using 3D printers to print aircraft parts in order to keep 30-year-old planes flying. The technology has attracted original manufacturers Boeing and Lockheed to see how the upgrades can make the planes perform even better than when new.
http://www.timesofisrael.com/3d-printers-make-30-year-old-air-force-planes-better-than-new/