SpaceX announced that it will slip the launch of the Dragon spacecraft aboard a Falcon 9 from the original 7 February 2012 date. The specific reason for the delay was not specified, but was related to a “sense of responsibility in returning US crewed access to LEO”.
NASASpaceFlight notes that SpaceX was slipping in order to allow for due diligence “safety checks” ahead of launch.
The Dragon mission is part of NASA’s Commercial Orbital Transportation Services (COTS) program. SpaceX plans to accomplish the milestones originally assigned to both flight two and three. The first flight occurred in December 2010.
It is expected that the slip will only be two to three weeks.