CST-100 Starliner
Overview
Boeing's crew capsule for NASA's Commercial Crew Program, built to ferry astronauts and cargo to the International Space Station under a $4.2B NASA award (alongside SpaceX's Crew Dragon).
Grounded from crewed ISS rotations after the 2024 Crew Flight Test's thruster failures and helium leaks. In November 2025 NASA and Boeing modified the Commercial Crew contract to reduce Boeing's committed crewed flights from six to four (two now optional) and repurposed the next mission, Starliner-1, as an uncrewed, cargo-only flight to validate system fixes. Boeing's Q2 2026 10-Q (filed July 28, 2026) pushed that target to no earlier than the fourth quarter of 2026, versus the April 2026 target set in November 2025; NASA's ISS operations integration manager declined on July 30, 2026 to commit to a 2026 launch at all, saying only that the agency will fly the mission when it is ready to go. NASA has not yet confirmed a date for Starliner's return to crewed service.