Claim: Japan's Shinano had the thickest hangar decks (7.5 in) among some of the World War II era aircraft carriers.
Evidence: Japan Shinano (64,800 tons) 7.5 in (190 mm) Armour thickness of some World War II era aircraft carriers 2 in (51 mm) 1.5–2.5 in (38–64 mm) 2.5 in (64 mm)       Japan Hiryū (17,800 tons) United_States Yorktown class (19,875 tons) United_Kingdom Ark Royal class (22,000 tons) United_Kingdom Illustrious class (23,000 tons) Japan Shōkaku class (25,600 tons) United_States Essex class (27,200 tons) Japan Taihō (29,770 tons) United_Kingdom Implacable class (23,500 tons) United_States Midway class (45,000 tons)