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This is a historical launch story, not a current watch alert. NASA and Boeing planned to launch Starliner’s first crewed test flight on June 1, 2024, despite a small helium leak in the spacecraft’s propulsion system. That attempt was scrubbed; Starliner launched on June 5, then returned without its crew in September after further propulsion problems. The astronauts came home aboard a SpaceX Crew Dragon in March 2025.
The decision to fly with a known leak was not a claim that Starliner was problem-free. NASA and Boeing said their analysis showed the observed helium leak was manageable for the planned flight. The June 1 attempt was later stopped by a fault in ground launch-sequencer equipment, separate from both the leak and an earlier Atlas V issue. Starliner ultimately carried NASA astronauts Barry “Butch” Wilmore and Sunita “Suni” Williams to orbit on June 5, 2024.
The headline’s “rolls the dice” framing is rhetorical. The evidence available before launch described an engineering tolerance assessment—not a quantified one-percent chance of failure. The eventual mission also showed why a launch decision and a decision to bring a crew home aboard the same vehicle are different judgments.
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What Starliner was—and why this flight mattered
Boeing’s CST-100 Starliner is a reusable crew capsule developed under NASA’s Commercial Crew Program to carry astronauts to and from low Earth orbit, including the International Space Station (ISS). Boeing built the spacecraft; United Launch Alliance (ULA) provided the Atlas V rocket; NASA was the customer, safety authority and mission operator.
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The Crew Flight Test was Starliner’s first flight with astronauts aboard, not its first flight overall. It was a test mission, not a routine crew rotation or proof that the system had completed certification. NASA wanted a second US commercial crew provider alongside SpaceX, while Boeing needed to demonstrate that Starliner could launch, dock, support a crew and return safely. That context mattered: an earlier uncrewed Starliner flight in 2019 failed to reach the ISS after software and mission-timing problems, so the crewed test faced close scrutiny.
What was leaking?
The issue was helium escaping from plumbing associated with a reaction-control thruster in Starliner’s service-module propulsion system. Helium pressurizes the system so it can feed propellant to thrusters. It was not a leak of cabin air, and it was not itself a propellant leak. Those distinctions matter: the reported issue concerned the propulsion system’s pressurization, not a breach in the crew cabin.
The leak was identified after an earlier launch delay, and teams investigated it with testing and analysis. NASA manager Steve Stich said the system could tolerate a leak rate up to 100 times the observed rate under the conditions considered. That is a statement about a modeled operating margin—not a claim that the spacecraft had a one-in-100 chance of failing, and not a guarantee that the leak could not change in flight. CBS News’ account of NASA’s assessment describes the leak and the tolerance statement.
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Why NASA and Boeing decided to proceed
Engineers assessed the leak and relevant hardware, considered the system’s remaining thrusters and operating margins, and concluded that the observed rate did not make launch unacceptable. The decision was made by NASA and Boeing mission teams, not Boeing acting alone. It also remained subject to launch criteria: a technical finding, countdown hold, weather or range constraint could still stop the attempt.
Proceeding preserved the launch opportunity and avoided immediately taking hardware apart or replacing it, which could have added time and exposed other issues. Delaying for repair could reduce uncertainty, but would also postpone an already long-delayed program. The trade-off was not “safe” versus “unsafe” in the abstract; it was whether the evidence, redundancy and operational limits supported this test flight despite a known anomaly.
Uncertainty remained. A leak could potentially worsen with launch vibration, changing temperatures or flight conditions. A loss of helium pressure could affect propulsion components; additional thruster failures could reduce the spacecraft’s ability to orient or maneuver. Those possibilities bear on both reaching the station and returning, and redundancy only helps if enough of the system remains available. “Within limits to launch” did not mean “no risk” or “guaranteed normal mission.”
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The launch attempts, in order
- May 6, 2024: The first attempt was scrubbed over an oxygen-relief-valve issue on the Atlas V’s Centaur upper stage. This was a launch-vehicle issue, not the Starliner helium leak.
- After May 6: Teams identified and investigated the helium leak in Starliner’s propulsion system. Target dates of May 21 and May 25 slipped while work continued.
- June 1: The planned attempt at 12:25 p.m. EDT was aborted because of a ground launch-sequencer problem. That was a ground-system fault, distinct from the Atlas V issue and the spacecraft leak.
- June 5: Starliner launched at 10:52 a.m. EDT on a ULA Atlas V with Wilmore and Williams aboard.
- June 6: Starliner docked with the ISS after a delay during its approach.
- September 6–7: Starliner undocked and landed without its crew after NASA decided the spacecraft should return uncrewed.
- March 2025: Wilmore and Williams returned to Earth aboard a SpaceX Crew Dragon.
How to watch the June 1, 2024 attempt
The June 1 launch window was scheduled to open at 12:25 p.m. Eastern Daylight Time from Space Launch Complex 41 at Cape Canaveral Space Force Station, Florida. The time conversions were:
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- 11:25 a.m. CDT (Central)
- 10:25 a.m. MDT (Mountain)
- 9:25 a.m. PDT (Pacific)
- 16:25 UTC
Those were the target time and date for the June 1 attempt, not the eventual liftoff. Launch schedules can change: a countdown may pause, a window may close, or teams may scrub and try again later. For the planned event, viewers could follow NASA Television and NASA’s online video coverage, as well as the joint NASA/Boeing broadcast. NASA and Boeing coverage for the eventual June 5 attempt began at 6:45 a.m. EDT and continued through post-docking crew remarks, according to Boeing’s mission update. Coverage information and launch chronology were also published by Wired and Space.com.
There is no live launch to watch now. For historical footage, start with NASA’s official mission coverage and mission archive; schedules and archived video pages can change over time. If using YouTube, check that the stream is actually from NASA or Boeing. Spaceflight events attract unofficial rebroadcasts, including misleading streams and cryptocurrency solicitations.
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What viewers would have seen—and what the mission was meant to prove
The intended sequence was an Atlas V liftoff, Starliner’s separation from the rocket and orbital insertion, then a rendezvous with and docking at the ISS. After docking, the astronauts would transfer to the station for a short stay, followed by undocking, atmospheric reentry and a parachute-assisted landing in the western United States. The original plan called for roughly a week to ten days in orbit.
Each milestone tested a different part of the system: launch and separation, spacecraft navigation and propulsion, automated rendezvous and docking, crew operations in orbit, and the return and landing sequence. A successful liftoff alone could not establish that Starliner had completed the full crewed test.
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What happened after liftoff
Starliner reached orbit and docked with the ISS, but additional propulsion anomalies and helium concerns complicated the mission. NASA extended the stay while teams assessed the spacecraft. In September, the agency chose to return Starliner without Wilmore and Williams; the capsule landed on September 7, 2024. The astronauts remained on the station and later returned on a Crew Dragon in March 2025. They were not simply “stranded”: NASA changed their return plan after determining Starliner should come back uncrewed.
The outcome qualifies any simple verdict on the original decision. NASA’s prelaunch analysis supported flying with the leak it had measured, but that did not settle how the propulsion system would perform across the whole mission. Launch and docking succeeded; the planned crewed return on Starliner did not. NASA published a later report on the propulsion-system anomalies in February 2026: NASA’s report (PDF).
Bottom line
The June 1, 2024 launch was an attempt, not the final launch: a ground sequencer problem stopped that countdown, and Starliner launched June 5. NASA and Boeing had judged the known helium leak manageable for launch, but the mission’s later propulsion problems led NASA to bring the capsule home without its crew. The history is a reminder that a vehicle can be cleared for one phase of flight without being cleared for every phase that follows.
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