The long-awaited first crewed test flight of Boeing's Starliner spacecraft was called off for at least 24 hours over a technical glitch with the Atlas V rocket that was being readied to launch the new astronaut capsule to orbit on Monday night.

The Boeing Starliner spacecraft is set for a historic and long-awaited astronaut demo launch Monday night at 10:34 p.m. on a United Launch Alliance Atlas V rocket from Space Launch Complex 41 at Cape Canaveral Space Force Station.

The launch of astronauts on a Boeing spacecraft will mark a first for the company, but will also bring human spaceflight back to a rocket and launch site after more than 50 years.

A United Launch Alliance (ULA) Atlas V rocket is scheduled to launch Starliner with NASA astronauts Butch Wilmore and Suni Williams on a shakedown mission to the International Space Station (ISS) on May 6. This will be Starliner's third flight, but the capsule's first with a crew aboard.

The Boeing CST-100 Starliner Crew Flight Test will launch two NASA veteran astronauts atop a United Launch Alliance Atlas V rocket from Cape Canaveral Space Force Station’s Space Launch Complex 41 targeting liftoff Monday,