Boeing's Starliner, which launched on June 5, 2019, carrying NASA astronauts Butch Wilmore and Sunni Williams, experienced multiple issues during its maiden voyage. The spacecraft suffered from five thruster failures and five helium leaks, prompting NASA to run tests on the ground to identify the main issue behind the thruster glitch. Despite these issues, the mission teams decided to return an uncrewed Starliner and bring back its crew on board SpaceX's Dragon spacecraft.