Soyuz T-15 is a quite interesting mission. It was the first spaceflight to two space stations. It launched on March 14, 1986 and first stayed 51 days aboard Mir to unload two Progress spacecraft. On May 5 it undocked for an one day travel to Salyut-7. 50 days later it returned to Mir with some instruments from Salyut-7. It landed on July 16. Mir has changed it's Orbit to conserve Soyuz T-15's fuel on the travel to and from Salyut.
Required Addons:
Soyuz 1: http://www.orbitmods.com/modules.php...sion#dldetails
Progress: http://www.orbitmods.com/modules.php...erry#dldetails
Salyut 6: http://www.orbitmods.com/modules.php...tion#dldetails
Baikonur: http://www.orbitmods.com/modules.php...plex#dldetails
Mir:
http://www.orbithangar.com/searchid.php?ID=2536
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Here's a nice timeline: http://space.kursknet.ru/cosmos/engl...hines/st15.sht