VIDEO: NTSB news conference on start of SpaceShipTwo investigation

Less than 10 weeks after a fatal crash that destroyed a suborbital rocket plane and raised questions about the future Virgin Galactic, the company’s chief executive says engineers are developing a test program for a replacement spaceship expected to fly later this year.

The fatal in-flight breakup of Virgin Galactic’s futuristic SpaceShipTwo rocket plane during a test flight last October was the result of pilot error, possibly triggered by a high workload, unfamiliar vibration and rapid acceleration, the National Transportation Safety Board concluded Tuesday.

Space station astronaut Reid Wiseman, preparing to return to Earth this weekend after 165 days in orbit, said commercial spaceflight represents the “next breakthrough” in aerospace technology, and that he hopes Virgin Galactic can ultimately turn that dream into reality despite the fatal crash of the company’s SpaceShipTwo rocket plane.