Re: The operational status of NCC 1701-A...?
It has been stated in a number offical trek publications that the Enterprise-A was the recently decommisioned Yorktown.
We've also seen in an official publication that the Enterprise-A
was previously the transwarp testbed vessel U.S.S. Ti-Ho
(Mister Scott's Guide to the Enterprise
The origins of the Enterprise-A
are up to personal interpretation as we're unlikely to ever see it's story in a canon setting.
"When I first heard about it (the Enterprise underwater), my inner Trekkie was in a rage. When I saw it, my inner kid beat up my inner Trekkie and made him go sit in the corner." - Bill Jasper