Despite appearances, Japan insists Izumo is not an aircraft carrier
ajw.asahi.com
The Maritime Self-Defense Force’s newest ship is simply a destroyer capable of carrying helicopters... with a length of about 250 meters and standard displacement of 19,500 tons, the Izumo is the biggest ship in the fleet...
The Maritime Self-Defense Force’s newest ship has a flight deck its entire length and is nearly the size of the Shokaku and Zuikaku aircraft carriers that took part in the 1941 attack on Pearl Harbor, yet Japan insists it is not an aircraft carrier.
http://ajw.asahi.com/article/behind_news/politics/AJ201401070039