A United Launch Alliance Atlas V rocket with Boeings CST-100 Starliner spacecraft aboard is seen on the launch pad brightened by spotlights at Space Launch Complex 41 at Cape Canaveral Space Force Station in Florida. Credit: NASA/Joel KowskyNASA, Boeing, and United Launch Alliance scrubbed the launch chance on Monday, May 6 for the firms Boeing Crew Flight Test to the International Space Station due to a faulty oxygen relief valve observation on the United Launch Alliance Atlas V rocket Centaur 2nd stage.NASA astronauts Butch Wilmore and Suni Williams exited the Starliner spacecraft at Space Launch Complex-41 at Cape Canaveral Space Force Station in Florida and will return to astronaut team quarters.Boeings CST-100 Starliner spacecraft aboard a United Launch Alliance Atlas V rocket is seen on the launch pad at Space Launch Complex 41 on Sunday, May 5, 2024, ahead of the NASAs Boeing Crew Flight Test, at Cape Canaveral Space Force Station in Florida. NASAs Boeing Crew Flight Test is the first launch with astronauts of the Boeing CFT-100 spacecraft and United Launch Alliance Atlas V rocket to the International Space Station as part of the agencys Commercial Crew Program.