|Owner:||United Federation of Planets|
|The commanding officer of the USS Yorktown in 2286, Captain Joel Randolph|
In Randolph's distress call to Starfleet Command, he noted that the ship had lost all power and that all non-essential crew were given hiber-sedatives to slow down consumption of life support reserves. Meanwhile, the chief engineer attempted to deploy a makeshift solar sail so as to focus and absorb radiation from a nearby sun they were orbiting, with the hopes of generating power to keep the crew alive. (Star Trek IV: The Voyage Home)
The USS Yorktown was the name of the central starship in Gene Roddenberry's first Star Trek proposal to NBC in 1964. The ship was named after the USS Yorktown (CV-5), a World War II American aircraft carrier, which in turn was named after the last major battle of the American Revolution, won in 1781 by a combined Franco-American army commanded by Gen. George Washington. (Star Trek Encyclopedia 2nd ed., p. 572) Coincidentally, the historical World War II Yorktown was a class sister of the historical USS Enterprise (CV-6), after which Roddenberry ultimately named his starship. (The Making of Star Trek, p. 164)
Gene Roddenberry, in a nod to his original name choice from 1964, suggested that the Yorktown was renamed as the USS Enterprise-A at the end of Star Trek IV, explaining why the latter ship seemed to be launched so quickly at the end of the movie. (Star Trek Encyclopedia, 3rd ed. p. 572) The season four internal studio document, Star Trek: The Next Generation Writers' Technical Manual (2nd ed. p. 6), co-written by Okuda, emphatically stated this to be the case, reaffirmed in the later officially endorsed Star Trek Fact Files and the 2010 reference book USS Enterprise Owners' Workshop Manual. This was further validated when, in the later Encyclopedia, Mike Okuda described the Yorktown in 2293 as the second ship to bear this name. The Starfleet practice of renaming a vessel for a very deserving other vessel was later canonically established in Star Trek: Deep Space Nine episodes "The Changing Face of Evil" and "The Dogs of War", when the USS Sao Paulo was rechristened as the USS Defiant, when the original Defiant was destroyed in the Dominion War.
NCC-1717 was the registry number given to the Yorktown by Gregory Jein in his influential "The Case of Jonathan Doe Starship" article, published in the April 1973 issue 27 of the T-Negative fanzine.  Michael Okuda took his cue from Jein's article and further propagated the registry in his reference work writings, most notably the Star Trek Encyclopedia. NCC-1704 was the registry number assigned to the Yorktown by Franz Joseph in Star Fleet Technical Manual.
Star Trek Encyclopedia, Star Fleet Technical Manual, and all other reference works confirm the Yorktown was a Constitution-class heavy cruiser. The producers of Star Trek: The Original Series had the name included on their final fourteen ship list at the start of its second season, belonging to the Constitution-class, then still referred to as "Starship-class" by them. (The Making of Star Trek, pp. 164-165)
The comic book series Star Trek: Romulans - Schism featured the Constitution-class Yorktown, endowed with Jein's registry number NCC-1717.
In the Star Trek: The Next Generation novel Crossover, the Yorktown was revealed to have become a museum exhibit on a starbase, but its bridge has been replaced with the original bridge of the first Enterprise. In the story in question, Captain Montgomery Scott stole the Yorktown to rescue Spock, recently captured by the Romulans, and fitted it with an ancient Romulan cloaking device (the one acquired in "The Enterprise Incident"). The mission proved successful, but aid was still required from the USS Enterprise-D for Spock, Scotty and the Unification movement to escape.