It's unclear when Starliner will fly again, and whether or not that mission will carry astronauts. More than six months after ...

A model of the Orion capsule on display at the NASA exhibit during the 35th Space Symposium at The Broadmoor in Colorado Springs, Colorado on April 9, 2019. Credit: JASON CONNOLLY/AFP/Getty Images ...

NASA has relied on private contractors to build spacecraft for every major human spaceflight program, starting with Project Mercury and continuing until the present. With these and other ...