The Z-plan brought up the idea of a hybrid warship appearing in the constructions department of the Kriegsmarine. The idea was to build a ship that could provide both, air cover for other Kriegsmarine units (including themselves) and were still usable for conventional commerce raiding. Therefore, a combination of an aircraft carrier and a cruiser/battleship was thought to be a solution for this task. The project never had a high priority, but with war coming closer one ship was finally finished in spring 1940, the 'Ludendorff'. She took part in the western campaign without battle action.
She was equipped was two triple 28cm turrets and four triple 15cm turrets. Her airwing was 31 units (9 x Ju-87 divebomber, 10 x Fi-167 torpedobomber, 12 x Me-109 E fighter)
The Ludendorff in 1945. 2cm quads are change to 3cm, airwing contains now Fw-190 fighters and additional Weserflug VTOLs. In 1946 she saw action at northern atlantic where 34 freighters and 2 destroyers were sunk by her. She missed the to Canada fleeing UBB HMS Superb only shortly.
In 1947 and 1948 she was placed in pacific waters for hunting down british ships and rebels. Indonesian divers managed to place some mines at her hull that did major damage. She was repaired so far she could float but never left the bay of bengal again. In 1958 she was scrapped.