Boeing engineers have completed hotfire testing on a flight-like model of the Starliner crew capsule, clearing a major hurdle before a pad abort test and a demonstration flight to the International Space Station later this summer, Boeing announced Friday.

These images show the liftoff of SpaceX’s Crew Dragon Resilience spacecraft on top of a 215-foot-tall Falcon 9 rocket from pad 39A at NASA’s Kennedy Space Center in Florida, carrying four astronauts on an expedition to the International Space Station.

SpaceX’s first Crew Dragon spacecraft, fixed to the forward end of a Falcon 9 rocket, emerged Thursday from the company’s hangar at the Kennedy Space Center in Florida for the quarter-mile journey to its launch mount at pad 39A, where liftoff is scheduled early Saturday on a critical test flight before astronauts strap into the ship later this year.