This morning, WhiteKnightTwo and #SpaceShipTwo successfully completed another test flight. After climbing to altitude, WhiteKnightTwo2 released SS2 and, a few seconds later, pilots Pete Siebold and Mike Alsbury conducted a "cold flow" test--running oxidizer through the propulsion system without actually igniting the motor.
This was an important test, and a great dress rehearsal for our next powered flight, which is coming soon.