As an aircraft carrier, "Sydney" operated with the RAN Fleet Air Arm's 20th and 21st Carrier Air Groups (CAGs), which were assigned alternately to the carrier. The former was made up of 805 and 816 Squadrons, while the latter was made up of 808 and 817 Squadrons. Twenty-four aircraft, split evenly between Hawker Sea Fury fighters and Fairey Firefly attack aircraft, were normally carried. Two Supermarine Sea Otter amphibious aircraft were carried for rescue duties (but were never required for this purpose); they were not attached to any squadron, but operated as the 'Ship's Flight'. The amphibians were removed from the ship at the start of her Korean War deployment, and were replaced by a helicopter. During the carrier's Korean War deployment, 805 Squadron was added to the 21st CAG to form a 38-strong wartime air group.