There are numerous threads on the forum where posters have suggested that German sharing of technology and weapons would likely have helped Japan's war effort, (there is no doubt that the fully integrated sharing between Britain and the United States aided their efforts) very seldom have I seen the inverse discussed. I'm going to break the various options down into separate posts for ease of discussion. 1.) Sharing of Japanese operational, doctrinal and technical information related to carrier ops. Japan was a leader in this field, however I think it really a "pipe dream" that Germany could have fielded a viable carrier fleet. I know they launched Graf Zeppelin in December 1938, but she was never completed, nor were the requisite escorts, support vessels or naval aircraft produced to make fielding her a practical reality. Germany lacked the resources and shipbuilding capacity to build and field a really capable surface fleet, especially one that could challenge combined British/US power. Germany probably pursued the most practical course in concentrating on submarine warfare and building more surface units, especially carriers, would only further erode the numbers of submarines (which never reached optimal numbers) they could produce and deploy.