text:  Well, in their first news conference, two NASA astronauts who should have been back on Earth weeks ago say they're confident Boeing's space capsule can return them safely, despite a series of breakdowns. Pilots Butch Wilmore and Sonny Williams were the first to ride Boeing's new Starliner capsule early last month, but similar helium leaks and thruster failures that delayed the initial flight have now kept them in orbit much longer. NASA hopes to have them back on Earth by the end of the month.