The US Navy has numerous large flat tops sitting around in "reserve," and storage awaiting final disposition. Now they include one nulcear powered CVN (Enterprise) which I believe truly is in reserve for a while, at least probably until the Ford is commissioned.When I served on the Kennedy in '72 & '73 it was the latest and greatest. Now the USN has zero oil burner CVs. But has 11 nuclear CVNs..Amazing..And in the whole rest of the Worlds navies there's only one CVN...ONE!
Sometime ago I realized that nearly every command I was stationed at in the USN is decommissioned. Except Great Lakes and the Nimitz..
All these commands are decommissioned..Kennedy, Midway, Hancock, America...
Nonetheless, there are many hundreds of thousands of tons of strong aircraft carriers out there, almost any of which if refurbished and re-commissioned would be far better than any other carrier afloat right now, with the possible exception of the French de Gualle and to some extent the two new building UK carriers, though I would personally argue against them.
Why?
Because, despite their size and modern electronics, the new Queen Elizabeth carrier's cability to perform the very most basic and foremost mission of an aircraft crrier, to sortie lots and lots of military aircraft that can do lots of harm to an enemy, is far, far below that of the capability of even the oldest, decommissioned super carriers the US has "sitting around."
Like any one of these for example (CVs 61, USS Ranger, CV 62 USS Independence, and CV 64 USS Constellation):
All of those "oil burners" were very strong full sized carriers capable of operating well over 80 aircraft off of their decks and with the facilities to maintain and keep them all. If someone wanted to and had the dollars and experience...and the US was willing...they could be again.
There just not a nation willing, or capable financially of refurbishing, operating and maintiaing such a carrier IMHO...or that the US feels comfortable allowing to do so. Even those old carriers contain too much valuable, hard fought and won carrier technology and information for the US to consider letting them go.