Part 4/10:
The Starliner's initial unmanned test flight in 2019 failed due to a software issue. Subsequent test flights have also faced complications. Most recently, during the astronauts' mission, significant mechanical issues emerged, particularly helium leaks and thruster malfunctions. These problems surfaced pre-launch and intensified post-liftoff, casting doubt on the spacecraft's capability to ensure the astronauts' safe return to Earth.