First Skylab crew: Conrad, Kerwin, Weitz. 404-orbits. First launch from Launch Pad 39B using a Saturn V umbilical tower and a "milkstool" assembly to allow the rocket to be serviced.
Skylab Rescue Mission. Not flown. Currently on display at Kennedy Space Center, with Apollo FVV spacecraft mockup. First stage engines and Apollo FVV service module replaced with fabricated duplicates in 1993-1994 due to severe corrosion.
Apollo-Soyuz Test Project, Crew: Stafford, Slayton, Brand. 136-orbits. Last Saturn IB flight.
AS-211
Unused. First stage on display with the S-IVB Battleship Test Stage stacked in a launch ready condition at the Alabama Welcome Center on I-65 in Ardmore, AL. Second stage, the S-IVB, is on display as a Skylab mockup at the U.S. Space and Rocket Center in Huntsville, AL.
AS-212
Unused. Second stage, S-IVB, converted to Skylab space station.