NASA declared that Boeing's plagued Starliner simply was too risky to use for the return of still-stranded astronauts Butch Wilmore and Suni Williams. Following months of investigations into malfunctioning thrusters and helium leaks,

The two Starliner astronauts said Friday they had no regrets about NASA's decision to extend their mission and to bring their spacecraft back to Earth without them, saying they had turned the page and were enjoying the transition to full-time space station astronauts.