By RICHARD TRIBOU Orlando Sentinel/TNS
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KENNEDY SPACE CENTER, Fla. — A pair of NASA astronauts have finally taken their historic ride on Boeing’s CST-100 Starliner making its first-ever human spaceflight Wednesday morning.

Barry “Butch” Wilmore and Sunita “Suni” Williams were back for a third time in a month once again taking a ride out to Cape Canaveral Space Force Station’s Space Launch Complex 41 to climb on board the spacecraft sitting atop a United Launch Alliance Atlas V rocket that lifted off amid mostly clear skies at 10:52 a.m. to take the pair to the International Space Station.

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“Let’s get going,” said Wilmore minutes before launch. “Let’s put some fire in this rocket and let’s push it to the heavens where all these tough Americans have prepared it to be.”

The pair are flying the Crew Flight Test mission, a followup to two uncrewed test flights of Starliner, the first of which came in 2019. That mission was a partial failure as it was not able to rendezvous with the ISS forcing a 2 1/2-year delay to Boeing’s program to remedy hardware, software and management issues. The second uncrewed test flight in 2022 made it to the ISS, but post-launch review and preparation for the CFT brought further delays with more hardware issues popping up.

But half a decade later, Williams and Wilmore were set to fly, entering quarantine on April 22. Finally, on May 6, they tried for the first time to take off from the Space Coast, but an issue with a fluttering valve on ULA’s upper Centaur stage scrubbed that attempt with about two hours to go on the countdown clock. Then a second attempt this past Saturday was scrubbed within four minutes of launch because of ULA computers not synching at the launch pad.

“I am very impressed with my colleagues for being such optimists and such professionals.” said NASA astronaut for future Starliner crew member Mike Fincke during NASA’s live commentary leading up to launch. “They’ve been in quarantine for a long time. You know we’ve been waiting for over five years to get Starliner launched, but they are very, very excited about today. You can see that they’re focused on getting the job done and they are very ready for this mission.”

In the end, the third attempt went smoothly.

The astronauts will spend just over 25 hours making their way to the ISS set to dock today at 6:15 p.m. HST, where they will spend about eight days on board before returning to Earth for a landing in one of five locations in the desert in the southwestern United States.

If successful, this will be the final required mission for Boeing under NASA’s Commercial Crew Program to achieve certification and set up regular rotational missions to the ISS, sharing duties with SpaceX.

“We need that access,” said NASA Associate Administrator Jim Free. “So right now we have we have one provider giving us that access to the space station. This will give us a second provider, which means if we have a problem with either, we have ways to get our crews to and from station, which helps keep the tempo that we’ve had for 23 years of having humans in low-Earth orbit, but also that opportunity to get the crews back if there’s an issue at all and keep that presence going.”

The flight comes just over four years since SpaceX made its first crewed flight to the ISS with its Crew Dragon spacecraft, which has since flown 13 times carrying 50 humans to space. That includes the four members of Crew-8 awaiting along with the rest of the seven-person crew of Expedition 71 aboard the ISS.

Starliner is only the sixth ever U.S.-based spacecraft to fly with NASA astronauts following Mercury, Gemini, Apollo, the space shuttleand SpaceX’s Crew Dragon. Williams is the first woman to fly on an orbital test flight among NASA’s spacecraft.

Starliner will also become the first U.S.-based capsule to make a land touchdown as Crew Dragon, Apollo, Gemini and Mercury all made waterlandings, as will the Artemis program’s Orion capsule that has yet to fly with humans. Russia’s Soyuz, though, features land touchdowns.