APTOPIX Boeing Astronaut Launch

Boeing's Starliner capsule atop an Atlas V rocket is seen at Space Launch Complex 41 after the launch attempt was scrubbed at the Cape Canaveral Space Force Station, late Monday, May 6, 2024, in Cape Canaveral, Fla.

 Terry Renna (AP)

Boeing called off its first astronaut launch because of a valve problem on the rocket Monday night.

The two NASA test pilots had just strapped into Boeing's Starliner capsule for a flight to the International Space Station when the countdown was halted, just two hours before the planned liftoff.

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