Boeing’s Starliner spacecraft sits atop an Atlas 5 rocket at Cape Canaveral. Credit: Michael Cain / Spaceflight Now / Coldlife Photography
Officials scrubbed the planned launch of a Boeing-built crew capsule Tuesday to examine a potential technical issue in the spacecraft’s propulsion system, delaying the start of a critical unpiloted test flight to prove the ship is ready to ferry astronauts to the International Space Station.