The Scaled Composites Model 348 White Knight Two (WK2) is a quadjet cargo aircraft that is used to lift the SpaceShipTwo spacecraft to release altitude. It was developed by Scaled Composites from 2007 to 2010 as the first stage of Tier 1b, a two-stage to suborbital-space crewed launch system. WK2 is based on the successful mothership to SpaceShipOne, White Knight, which itself is based on Proteus.

With an "open architecture" design and explicit plans for multi-purpose use, the aircraft could also operate as a zero-g aircraft for passenger training or microgravity science flights, handle missions in high-altitude testing more generally, or be used to launch payloads other than SpaceShipTwo. A study of use of the aircraft as a forest fire water bomber has also been mentioned, one that would utilize a large carbon composite water tank that could be quickly replenished to make repeat runs over fires.

The first White Knight Two is named VMS Eve after Richard Branson's mother Eve Branson; it was officially unveiled on July 28, 2008, and flew for the first time on December 21, 2008. The second is expected to be named VMS Spirit of Steve Fossett after Branson's close friend Steve Fossett, who died in an aircraft accident in 2007.

Info: Virgin Galactic Scaled Composites 348 White Knight II, N348MS New  Livery