Soyuz can fit 3 but can be flown with less (modern Soyuz can be unmanned). They arrived on Soyuz T-13; later, T-14 arrived with a relief crew of 3; T-15 came w

Soyuz can fit 3 but can be flown with less (modern Soyuz can be unmanned). They arrived on Soyuz T-13; later, T-14 arrived with a relief crew of 3; T-15 came with 2. So that's 7 cosmonauts lofted with 9 seats. (T-15 actually docked with both Salut 7 and Mir, the first spacecraft to ever dock with two different stations on the same mission.)