The VSS Enterprise (tail number: N339SS) was the first SpaceShipTwo (SS2), built by Scaled Composites for Virgin Galactic. As of 2004, it was planned to be the first of five commercial suborbital SS2 spacecraft planned by Virgin Galactic.It was also the first ship of the Scaled Model 339 SpaceShipTwo class, based on upscaling the design of record-breaking SpaceShipOne.The VSS Enterprise's name was an acknowledgement of the USS Enterprise from the Star Trek television series.