Kirk once said that there were only a dozen like her in the fleet, but whether that refers to the Constitution class or something else wasn't explicitly stated.Tinadrin Chelnor wrote:Well, to be fair, the E-Nil was original supposedly one of 12 vessels of the class, and they were considered frontline vessels.
That's one version of what happened, and makes a degree of sense given that she was decommissioned after less than a decade, but again it's not explicit. She may have been newly commissioned, and her decommissioning have been for a change of name to free up "Enterprise" for the E-B.From what I recall of the E-A, I believe I read somewhere that she was supposed to be the Yorktown, but was commissioned as Enterprise after the previous ship was lost. Obviously they could have simply kept the name for a newer ship, but guess they wanted Kirk back in command asap or something.