NASA's Crew-9 mission now has only 2 astronauts instead of 4. The last-minute change gives room to return 2 astronauts on the ISS who needed a new ride home.

NASA cuts 2 astronauts from SpaceX Crew-9 mission to make room for Boeing Starliner crew

Source: space
Source Link: https://www.space.com/spacex-crew-9-astronauts-cuts-boeing-starliner-return