Boeing Starliner-1

Boeing Starliner-1, also called Post Certification Mission-1 (PCM-1), is planned to be the first operational crewed mission of the Boeing Starliner to the International Space Station (ISS) as part of the Commercial Crew Program. It will be the fourth orbital flight mission of the Starliner overall. It is scheduled to launch no earlier than early 2025, transporting members of a future ISS Expedition.

Crew
As this marks the first operational flight of Starliner, a Russian cosmonaut is not expected to be on board as Roscosmos has stated they do not want to put Russian cosmonauts on Starliner until it has flown successful Commercial Crew Program flights.

On 18 April 2022, NASA said that it has not finalized which of the cadre of Starliner astronauts, including Barry Wilmore, Michael Fincke, and Sunita Williams, will fly on the CFT mission or this mission. On 16 June 2022, NASA confirmed that CFT will be a two-person flight test, and Williams was assigned to the CFT mission.

On 30 September 2022, Scott D. Tingle was assigned as commander and Michael Fincke as pilot. Fincke is also a backup crew member on Boe-CFT.

On 22 November 2023, Joshua Kutryk was assigned to the mission by the Canadian Space Agency. Expedition 72/73 astronaut Kimiya Yui of the Japan Aerospace Exploration Agency is expected to take the fourth seat.

Due to its delays, several astronauts originally assigned to Starliner-1 were reassigned to other missions: In 2018, Sunita Williams was planned to fly on Starliner-1, she was later reassigned to the earlier CFT. Jeanette Epps was added to the Starliner-1 mission on 25 August 2020 but reassigned to SpaceX Crew-8 in August 2023. Koichi Wakata was officially added to the Starliner-1 mission on 21 May 2021 but then reassigned to the SpaceX Crew-5 mission which launched in October 2022.

Mission
This mission was intended to be the first reuse of a Starliner spacecraft. That vehicle was initially flown as the first uncrewed Orbital Flight Test mission in December 2019. On 22 December 2019, Sunita Williams (at that time assigned to be commander on this mission) announced the name "Calypso" for the spacecraft. Calypso was used for Boe-CFT instead. Spacecraft 2, which was used for Starliner Orbital Flight Test-2 will instead be flying this mission.