Re: The operational status of NCC 1701-A...?
It should be noted that ST6 does not exactly indicate a change in the ship's status yet. True, Uhura receives a message saying that "they" are to be decommissioned, yet Kirk responds with a log entry that refers to the ongoing mission of this very vessel under future crews.
I recall being very confused about that sequence of events when I first saw ST VI. The decomissioning message seems to come out of nowhere & then Kirk's log entry seems to indicate that he believes that the ship will be passed on to another crew. It is only because of the launch of the 1701-B in Generations that we now assume that the ship was being decomissioned, but it wasn't so clear upon first viewing.
"Canon is only important to certain people because they have to cling to their knowledge of the minutiae. Open your mind! Be a Star Trek fan and open your mind and say, 'Where does Star Trek want to take me now'." - Leonard Nimoy