Transport and Logistics: The Supply Line to Orbit
How is a station supplied, and what changes when the ISS ends?
Chapter summary
Every uncrewed cargo flight to the ISS and Tiangong since 2000, from the GCAT launch log, set against the vehicles available to commercial stations.
Key takeaways
- 1
The ISS received 39 cargo flights in 2021–2025; Russia’s Progress flew 18 of them and will not supply Western stations.
- 2
Without Progress, the Western cargo fleet flew about four flights a year from two vehicles; Dream Chaser and Nyx have not yet flown.
- 3
Only Cargo Dragon returns cargo routinely, so its capacity is the market’s down-mass capacity.
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The Human Spaceflight Record: Demand Evidence, 2000–2026
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