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.
"Just give me two seconds, alright, you mad bastard!" - Montgomery Scott, Star Trek Into Darkness