

Some take this to mean that there were twelve constitution class ships in Starfleet, some assume that it means there are thirteen - the Enterprise and twelve more like it. "There are only a dozen like her in the fleet." When the pilot, Captain Christopher, compliments Kirk on the advanced nature of the Enterprise Kirk smiles proudly and declares : When the ship's tractor beam destroys the aircraft, they beam the pilot aboard. Disabled and struggling to make orbit, they are intercepted by a USAF fighter. The ship finds itself in Earth's atmosphere in the year 1969.
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The Enterprise is thrown through time and space after an encounter with a 'black star'. One such comes in the TOS episode 'Tomorrow is Yesterday'. There are remarkably few direct statements regarding the size of Starfleet. The latter seasons of Deep Space Nine have shown that for once this policy worked just as it was supposed to! For most of Trek history the size of the fleet was thought to be quite small, but this was kept deliberately vague so as not to tie the hands of future writers who may want to suddenly show large fleets of ships.

One of the most talked about issues is just how many ships Starfleet counts amongst its ranks. It's remarkable that more than thirty five years after the first Star Trek episode was made, there is still no clear idea on many basic issues concerning Starfleet and the Federation.
