▁and ▁other ▁scient ists ▁to ▁see ▁our ▁world ▁in ▁a ▁completely ▁new ▁light ." ▁ ▁On ▁March ▁ 2 2 , ▁ 2 0 1 0 ▁the ▁V MS ▁E ve ▁completed ▁its ▁ 2 5 th ▁flight , ▁the ▁first ▁occasion ▁it ▁carried ▁the ▁Space Sh ip Two , ▁V SS ▁Enter prise . ▁In ▁a ▁flight ▁of ▁ 2 ▁hours ▁ 5 4 ▁minutes , ▁it ▁asc ended ▁to ▁an ▁alt itude ▁of ▁. ▁The ▁launch ▁customer ▁of ▁White ▁Knight ▁Two ▁is ▁Virgin ▁Gal actic , ▁which ▁will ▁have ▁the ▁first ▁two ▁units , ▁and ▁exclusive ▁rights ▁to ▁the ▁craft ▁for ▁the ▁first ▁few ▁years . ▁ ▁Fl ight ▁test ▁program ▁ ▁An ▁extensive ▁flight ▁test ▁program ▁of ▁V MS ▁E ve , ▁with ▁nearly ▁twenty ▁fl ights ▁between ▁December ▁ 2 0 0 8 ▁and ▁August ▁ 2 0 0 9 , ▁was ▁undert aken ▁to ▁validate ▁the ▁design ▁and ▁gradually ▁expand ▁the ▁aircraft ▁operating ▁en velope . ▁ ▁The ▁flight ▁tests ▁were ▁complete ▁by ▁September ▁ 2 0 0 9 , ▁and ▁testing ▁with ▁Space Sh ip Two ▁began ▁in ▁early ▁ 2 0 1 0 . ▁ ▁A ircraft ▁specific ations ▁ ▁See ▁also ▁ ▁Sc aled ▁Compos ites ▁Prote us , ▁prede cess or ▁to ▁White K night One ▁ ▁White K night One , ▁prede cess or ▁to ▁White K night Two ▁ ▁Sc aled ▁Compos ites ▁Str at ola unch ▁Roc , ▁derivative ▁of ▁White K night Two ▁ ▁Space Sh ip Two , ▁payload