Illastries is rightfully considered a milestone ship in the evolution of the aircraft carrier class. It had high speed, powerful anti-aircraft weapons and a number of advanced solutions in the field of ship architecture. But its main advantage lay in a fundamental innovation - an armored flight deck, which significantly increased the protection of an aircraft carrier from air attacks. It is enough to cite the following fact: for the period 26.3-25.5.1945, losses on all British aircraft carriers located in the Pacific Ocean (including as a result of 7 kamikaze hits) amounted to only 41 pilots and 44 crew members, which is an order of magnitude less than on American aircraft carriers that did not have an armored flight deck.