波音公司载人航天器的首次飞行再次推迟

"Boeing's Starliner spacecraft faces another delay in its first crewed flight to the International Space Station, as a technical issue has postponed the mission until at least May 21. The initial launch was called off due to a valve problem on the Atlas V rocket, and now a small helium leak in the service module of the spacecraft needs to be addressed. The company is working to resolve the issue, with a new liftoff scheduled for 4:43 pm (2043 GMT) on May 21. Astronauts Butch Wilmore and Suni Williams have returned to Houston while the engineers address the glitch. This delay adds to the years of setbacks the mission has already faced, and comes at a challenging time for Boeing amidst a safety crisis in its commercial aviation arm. NASA is eager for Starliner's success to certify a second commercial vehicle for transporting crews to the ISS, following SpaceX's achievement with its Dragon capsule in 2020."