Izumo will not have its own AEW aircraft, will rely on E-767
JS Izumo will not be able to have its own complement of airborne early warning (AEW) aircraft after conversion into a fixed-wing aircraft carrier as it will be deemed to have offensive capabilities.
航空自衛隊 [GJSTUv1], via Wikimedia Commons
Therefore, the defense ministry has decided that the carrier will be protected by early warning aircraft such as the E-767 and E-2D from the Japan Air Self-Defense Force.
Read more here:: Alert5 (Air)