In a disappointing delay, Indian-American astronaut Sunita Williams came tantalizingly close to making history as the first woman to fly aboard a brand new spacecraft on its maiden crewed mission.

However, just 90 minutes before the scheduled liftoff on Tuesday morning, Boeing’s highly anticipated Starliner capsule launch was scrubbed due to an unresolved technical issue with the crew cabin’s life support systems.

Williams, a trailblazing veteran of two space shuttle missions, and her fellow NASA astronaut Barry “Butch” Wilmore were already strapped inside the gumdrop-shaped Starliner capsule atop an Atlas V rocket at Cape Canaveral’s Launch Complex 41.

The countdown was halted at T-minus 2 hours, 28 minutes when a valve controlling the flow of oxygen to the capsule’s cabin exhibited “off-nominal” readings according to NASA.

The scrub call came after a tense two-hour delay in the countdown procedures as Boeing mission controllers desperately tried to troubleshoot the oxygen valve issue.

Even with a built-in 24-hour turnaround window, the technical hiccup could not be resolved in time, leading mission managers to officially postpone the launch for at least 48 hours.

We can’t contain our emote-ions! Tune in to our @Twitch stream on May 6 as we launch #Starliner, as well as our latest Twitch feature: custom emotes! https://t.co/5tQAi8GE3I pic.twitter.com/HwtYwkMumJ

— NASA (@NASA) May 5, 2024

“We don’t have enough time today to work through all the processes,” acknowledged NASA Associate Administrator Bob Cabana. No new target launch date has been set as Boeing and NASA teams commence an intensive investigation into the root cause of the oxygen system malfunction.

Despite being “deeply disappointed,” NASA officials praised the prudent decision to stand down and prioritize crew safety.

For the 59-year-old Williams, this launch represented an opportunity to etch her name into history books once again as the first woman to fly a brand new spacecraft design on its crewed debut.

Already one of NASA’s most celebrated astronauts, she had directly contributed to the development of Boeing’s next-generation Starliner capsule.

“It feels great to be putting into practice what us astronauts have been training and certifying on for years,” Williams said before the launch setback.

She was eagerly anticipating her return to the International Space Station (ISS), where she spent over 10 months cumulatively during previous shuttle missions, Expedition 14/15 in 2006-2007 and Expedition 32/33 in 2012.

Williams’ first spaceflight in 2007 saw her log almost 30 hours across four spacewalks, setting a new endurance record for female astronauts at the time.

She also made history as the first person to complete a triathlon in space by running, biking, and simulating swimming exercises aboard the orbital complex.

For this Starliner test flight, the Indian-American trailblazer had packed a small idol of the Hindu deity Lord Ganesh as her “good luck charm,” continuing a tradition from prior missions when she flew a copy of the Bhagavad Gita scripture.

Williams even envisioned squeezing in her signature high-intensity exercise regimen like spacewalking to maintain peak fitness over the planned 10-day stay aboard the ISS.

While deeply disappointing, the launch delay represents a temporary setback for the veteran astronaut on the verge of another pioneering milestone.

For Williams and Wilmore, the critical mission objectives remain the same – successfully flying Boeing’s Starliner crew capsule to the space station on an uncrewed test flight and returning safely to Earth via parachute landing.

This dress rehearsal is vital for NASA to certify the public-private Starliner spacecraft for regular crewed missions to the ISS under the agency’s Commercial Crew program.

Since ending the space shuttle era in 2011, NASA has been relying solely on Russian Soyuz vehicles for transporting astronauts at a cost of roughly $90 million per seat.

With Boeing’s Starliner and SpaceX’s Crew Dragon capsules in the pipeline, NASA aims to reduce costs by sharing ISS transportation with the commercial space industry.

But the vehicles must first prove their mettle on challenging test flights like the one Williams is tasked with.

While launch dates remain uncertain as engineers troubleshoot the recent oxygen valve issue, one thing is clear – whenever the Atlas V rocket is cleared to blast off, the pioneering Indian-American astronaut Sunita Williams will be ready to reach new frontiers.

Her trail of “firsts” and records have inspired countless young girls and women to pursue their dreams without limits.

As a child of Indian immigrants, Williams defied expectations and shattered stereotypes by entering NASA’s elite astronaut corps. With perseverance, she rose to the ranks of the agency’s most accomplished spaceflight veterans.

Now poised to make history yet again, Williams’ unwavering determination encapsulates the indomitable human drive to explore the cosmos.