Soyuz MS-24

The original three-Russian member crew for this scenario was named in May 2021. American astronaut Loral O'Hara replaced Andrey Fedyaev as a part of the Soyuz-Dragon crew swap system of keeping at least one NASA astronaut and one Roscosmos cosmonaut on each of the crew rotation missions. This allows continuous space station occupation by US and Russia and keep backup crew scenarios to prevent vehicle either vehicle grounding like Soyuz MS-10 launch failure or to compensate for delays in launch of crew rotation missions of either vehicles like SpaceX Crew-3, that was delayed due to unfavorable launch weather conditions.[2] They were originally assigned to Soyuz MS-23 mission, but were moved to MS-24, due to Soyuz MS-22 coolant leak accident that required MS-23 to be launched uncrewed as its replacement. Oleg Kononenko is assigned for an one year long mission with his MS-24 crewmate, Nikolai Chub that started on September 15, 2023. If the mission lasts 300-365 days, Kononenko will have spent a total of 1,036-1,101 days in space, exceeding the current record of 878 days by Gennady Padalka. He will thus also become the first person to stay 1,000 days in space.

Primary Crew

Position	Launching Crew member	Landing Crew member
Commander	Oleg Kononenko, Roscosmos Expedition 69/70/71 Fifth spaceflight	Oleg Novitsky, Roscosmos Visiting Fourth spaceflight
Flight Engineer/ Spaceflight Participant	Nikolai Chub, Roscosmos Expedition 69/70/71 First spaceflight	Marina Vasilevskaya[3] Visiting First spaceflight
Flight Engineer	Loral O'Hara, NASA Expedition 69/70 First spaceflight

Backup crew

Position	Crew member
Commander	Aleksey Ovchinin, Roscosmos
Flight Engineer 1	None
Flight Engineer 2	Tracy Caldwell-Dyson[4], NASA