Statistics
As of November 19, 2012 (2012 -11-19), 207 individuals have made 337 spaceflights to the ISS, including the three people currently at the ISS (Expedition 34). NASA astronauts Mark E. Kelly and Frederick W. Sturckow plus cosmonaut Yuri Malenchenko made four spaceflights to the ISS, while 24 people made three and 73 people made two. Note that this list assigns individuals with dual citizenship to their country of primary residence at time of launch (for example, the Iranian-American space tourist Anousheh Ansari is only listed under the United States).
All private space travel is aboard the Russian Soyuz spacecraft. When only two crew members are required in the three seat Soyuz, and additional cargo is not sent, the additional seat is sold to the general public through Space Adventures. Private travelers remain on the ISS during handover from one expedition crew to the next, generally a week or two. The NASA Space Shuttle carried 7 crew members, and the longest docking with the ISS was 11 days. Many visitors to the ISS were accommodated for short periods during NASA shuttle dockings. NASA stated it was "not interested" in private spaceflight from the beginning of the ISS and has not changed its position.
Read more about this topic: List Of International Space Station Visitors
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