The Germans may have "converted" an old merchant marine ship into a light aircraft carrier back then. I can't really remember. Probably flew old bi-planes if so, anyway (bi-planes can take off, and land, in very, very short distances - which is important for tiny/light carriers).
Pretty difficult to project force without aircraft carriers, though. The Germans *badly* lagged in this department, in code breaking, in computers, and in nuclear research.