The Boeing CST-100 Starliner is a spacecraft designed to transport astronauts to and from the International Space Station (ISS). It is part of NASA's Commercial Crew Program, which aims to develop safe and reliable crew transportation systems. The Starliner can carry up to seven passengers and is designed for multiple missions. The spacecraft is launched atop an Atlas V rocket and features advanced safety systems, including an automated docking capability. The Starliner is built to be reusable, allowing for cost-effective space travel. Its first uncrewed test flight took place in December 2019, with future missions planned to carry astronauts.