Do note that the carrier program under discussion - whether it is nuclear powered or not - is a
replacement for
Cavour, rather than supplement. She is intended to be replaced around 2040 (most likely it will be an early to mid-2040s replacements) by the future carrier platform.
With regards to the discussion about hangar capacity from 2022 - I aware I'm massively late to the party here, but one should avoid playing Tetris too much, with
Cavour and any other carrier. In practice,
Cavour's hangar is divided into twelve ~230mq parking areas, accommodating twelve AW101 helicopters, or ten fixed-wing aircraft - AV-8B+ or F-35B. I am not sure what the fixed-wing stowage is rated as lower than the helicopter stowage despite them taking up the same area - it would appear that two of the parking areas are rotary only?
This is fairly consistent when compared to the hangars of the
Queen Elizabeth-class carriers, which have a surface area 67% greater (163 x 29 m, 4,727 mq overall versus 134.2 x 21 m, 2,818 mq overall) and are not constrained by a centerline hangar. They can accommodate ~22 AW101 or 20x F-35B in their hangar.
In both cases, the balance of their rated air group is accommodated on the flight deck, similarly to American carriers. This can actually be quite a lot - more than can be stored in the hangar, as seen with this image showing off fifteen F-35B (8) and AV-8B+ (6, +1 TAV-8B) on her flight deck along with two NH90's. But in terms of internal logistical limits, the ship is generally not meant to carry more than a single squadron of fixed-wing aircraft for a sustained period, so 10-12 fixed-wing aircraft is more of a typical load with 15 as a practical maximum, with the rest of the air group being rotary aircraft.
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It is also known that the MMI is closely watching British experimentation with UAV/UCAV integration on the
Queen Elizabeth-class, and drones will inevitably become a part of her air group in the future. Most critical of all is to fill the same AEW gap the Royal Navy faces, with the helicopter-based systems being inadequate (the British will persist with Crowsnest as an interim solution, while the Italian HEW-784 system on the EH-101A's has not been operated for a while).