I got curious, the only carrier left now in the Mothball fleet is the USS Kitty Hawk CV-63. The first of a class of 3. The Kitty, The Connie (Constellation) CV-64 and the America. CV-66. (Note The Enterprise was CVN-65). It looks like the JFK CV-67 was considered a variant of the Kitty Hawk Class, I thought it was in its own class of one.
The Connie was on station with my Ranger CV-61 in San Diego while I was serving. The Kitty was there for a while also, but it seemed like they were usually at sea if we were in and vice versa.
IIRC it sorta straddled the line. It was a larger slightly modernized derivative of the Kitty Hawk class. Much as the KH was a larger and modernized derivative of the Forrestal class.
Which when JFK was laid down it was intended to become the lead ship for the new standard class for non-nuclear CVs.
Then the Enterprise turned out to be a success and the interest in building future non-nuclear CVs crashed. No more JFK class and the JFK itself was retconned back into a super-Kitty.
Then with many lessons expensively learned from Enterprise, they started in on a dedicated nuclear carrier class. Which borrowed at least some aspects of JFK’s design & equippage. But with vastly different interior layout due to the much different and smaller powerplant arrangements and the vastly reduced space no longer needed for bunker fuel. And thus was the Nimitz class born.