Tier Two

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Tier Two is Scaled Composites and Virgin Galactic's orbital human spaceflight program. The program's spacecraft will be based on SpaceShipTwo if that is successful. Initial plans call for the spacecraft to be named SpaceShipThree.

Speculations abound on whether they will attempt to qualify SS3 for America's Space Prize.

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Designation sequence: SpaceShipOne SpaceShipTwo SpaceShipThree
Related development: White Knight One White Knight Two White Knight Three
Development program: Tier One (100km) Tier 1b (140km)[1] Tier Two (orbital)
Comparable aircraft: North American X-15 & NASA X-38 & Space Shuttle