structural:summarization, linguistic:voice_change
Fleet operations

A wide variety of crewed and uncrewed spacecraft have supported the station's activities. Flights to the ISS include 37 Space Shuttle, 89 Progress, 70 Soyuz, 5 ATV, 9 HTV, 2 Boeing Starliner, 43 SpaceX Dragon and 20 Cygnus missions.

There are currently eight docking ports for visiting spacecraft, with four additional ports installed but not yet put into service:

Forward ports are at the front of the station according to its normal direction of travel and orientation (attitude). Aft is at the rear of the station. Nadir is Earth facing, zenith faced away from Earth. Port is to the left if pointing one's feet towards the Earth and looking in the direction of travel and starboard is to the right. Cargo spacecraft that will perform an orbital reboost of the station will typically dock to an aft or nadir facing port.