alternatehistory.com

With a POD no earlier than 11/11/1918 have the German navy possess four aircraft carriers at least equal in capability of both ships and aircraft to those of Britain, America or Japan by 07/12/1941.

Note that this says German Navy not Reichsmarine or Kriegsmarine and that it does not give a specific carrier or plane in any of the other navies so there's quite a bit of flexibility here.
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