Conversion planning began in May 1942, and had the conversion been finished, she would have been the largest German aircraft carrier, longer even than the purpose-built Graf Zeppelin-class aircraft carriers. The work was canceled in November 1942, however, after design problems, including serious instability and structural weaknesses, proved to be irreconcilable. No work was done on the ship, which was eventually seized by the US Army and used as a troop transport following the end of the war.