I certainly believe that part of the USN's plan to extend carrier availability worldwide over the next few decades is to rely on allied navies to help fill gaps. Not that there are many, but recent years have seen overwork and reduced maintenance schedules lead to problems that will be resolved eventually but may well reoccur given similar circumstances. The announced deployment of USMC F-35Bs aboard the QECs along with other rotary wing types alongside the UK aircraft aboard will lead to a capability superior to an America class LHA but inferior to a CVN. Still enough to make an impact on the world stage if a CSG is unavailable.
In the next decade there may well also be moves behind the scenes to persuade other allies to facilitate similar arrangements, for example the US could help pay for necessary upgrades to the RANs Canberra class LHDs in order for them to operate a sqn of USMC F-35Bs on joint ops, even if the Aussies themselves ultimately can't find the cash to do the work and buy the 'B's for themselves. Spain, Italy and eventually Turkey could also fall into this category too...
Such ships whilst certainly not being a match in terms of capability for a USN CVN, definitely would have a lot of political value and these kind of operations buy a lot of capital for their Governments. That alone may make it a worthwhile venture. It's certainly the case for the UK Government with the QECs.
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