History time for context: Via Jane's Fighting Ships
First we will look at the Essex-class aircraft carriers as seen in 1949-50, 1958-59, 1971-72, and 1987-88.
As you may know, the Essex-class was built through World War II as the main fleet carrier for the United States Navy. 24 of these were completed.
In 1949-50:
All 24 of these completed ships are classified as Essex-class even though there are some hull differences between long and short hulls and the USS Oriskany, being delayed and the last completed that year, would be more different. They are all listed as CV with 9 - 21 being the first order, 31 - 40 being the second order, 45 - 47 being the third order, and 50 - 55 being the fourth order. Eight ships from the three later orders were cancelled. 22-30 were taken by light carriers (CVL) of the Independence-class and 41-44 (as well as 56 and 57) by the heavier carriers of the Midway-class (CVB). 48 and 49 were two more light carriers of the Saipan-class (CVL).
Jane's Fighting Ships does not use the sometimes used designator "Ticonderoga" class for the long hulled ships. the U.S. Navy never maintained any institutional distinction between the long-hull and short-hull members of the Essex class.
In 1958-59:
These ships are now listed into two groups. The 11 "Oriskany" type (Improved "Essex" Class), with have angled flight decks and enclosed hurricane bows. These are attack carriers listed with the letters CVA.
The second group is the less modified "Essex"-class, of which there are 13. A few have angled flight decks. These are assigned for anti-submarine duty and listed as CVS. This group also includes the ships that are basically inactive, like USS Franklin and USS Bunker Hill, which were not fully returned to service after damage sustained in 1945.
In 1971-72:
The old Essex-class is being retired. Six are still in active service and ten more still exist in reserve out of the 24 completed.
Three are listed as Hancock-class attack carriers. These use the CVA designation (USS Hancock CVA-19, USS Bon Homme Richard CVA-31 -reserve, and USS Oriskany CVA-34)
Twelve are listed as Essex-class, with 11 being ASW Support carriers and one being a training carrier. The 11 are listed with the CVS while the training carrier (USS Lexington) is listed as CVT-16. Active ships are: USS Intrepid CVS-11, USS Ticonderoga CVS-14, USS Lexington CVT-16, and USS Wasp CVS-18.
The one remaining existing carrier not on this list is USS Bunker Hill (AVT 9, ex-CVS 17). She is listed as Ex-Aircraft Carrier, Electronics Test Ship. A former Essex-class aircraft carrier.
A small number of these carriers were converted to Landing Platform Helicopter (LPH) for the US Marines between 1959 and 1970. These were USS Boxer (LPH 4 ex-CV 21, ex-CVA 21, ex-CVS 21), USS Princeton (LPH 5, ex-CV 37, ex-CVA 37, ex-CVS 37), and USS Valley Forge (LPH 8, ex-CV 45, ex-CVA 45, ex-CVS 45). These were the three active carriers that did not get an angled flight deck. I don't have a Jane's Fighting ships from the 1960s. The 1971 book calls them Essex-class under the Amphibious Assault Ships section, but have been decommissioned.
In 1987-88:
There are three of the old Essex-class ships left in the US Navy. These are listed as being from the Hancock and Intrepid classes. What is left is USS Lexington AVT 16 (training carrier - active), USS Bon Homme Richard CVA 31 - reserve, and USS Oriskany CV 34 - reserve. USS Hancock, USS Shangri-La, and USS Intrepid have only just been removed from the Navy list from the reserve fleet the year before.
USS Lexington will remain in service as a training carrier until 1991.
Today when one wants to search for any of these ships, one looks up "Essex-class", rather than any of the other class designations the had over the years.
Wikipedia lists the following
Essex-class ships into that it calls the final assignments of the classes in the Naval Vessel Registry:
CVS-10 Yorktown class (SCB-27A): Essex, Yorktown, Hornet, Randolph, Wasp, Bennington, Kearsarge, Lake Champlain
CVS-11 Intrepid class (SCB-27C + SCB-144): Intrepid
CVA-19 Hancock class (SCB-27C): Ticonderoga, Hancock, Bon Homme Richard, Oriskany, Shangri-La
AVT-8 Franklin class (unreconstructed ships): Franklin, Bunker Hill, Leyte, Antietam, Tarawa, Philippine Sea
AVT-16 Lexington class (training carrier): Lexington
LPH-4 Boxer class (helicopter assault conversions): Boxer, Princeton, Valley Forge
I might do this again for a cruiser class and a destroyer class or two, but the Essex-class should be enough for now.