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In the series, they only mentioned two, but in the ENT relaunch books there are at least six. Each one named for one of the NASA space shuttles: Enterprise, Columbia, Challenger, Discovery, Atlantis and Endeavour; NX-01 through NX-06 respectively. All but Enterprise and Endeavour were destroyed, or reported missing in the case of Columbia, during the Earth-Romulan War, these books suggested that production of the class ended after Endeavour in favor of cheaper Daedalus class ships. Another book, TNG: Indistinguishable From Magic, claims that fifteen or so more were built late in the war.-Cpthunt (talk) 04:01, September 23, 2012 (UTC)
The mirror universe built at least 9. The NX-09 Avenger appeared in ENT: In a Mirror Darkly. 18.104.22.168 19:37, September 24, 2012 (UTC)