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=={{int:filedesc}}== {{Information |description={{de|1=Erstflug HY4 am Flughafen Stuttgart. Am 29. September 2016 flog das Wasserstoff-Brennstoffzellen-Flugzeug HY4 über dem Flughafen Stuttgart.}} |date=2016-09-29 11:36:37 |source=http://w...