STS-129 was a Space Shuttle mission to the International Space Station (ISS) flown by Space Shuttle Atlantis. The mission launched on November 16, 2009, and was the twenty-first shuttle mission to visit the ISS. The primary objective of the mission was to deliver and install the S6 (S-six) Truss, the C6 (C-six) Truss, and the QD (Quick Disconnect) Flange Extension to the ISS. The mission also included the delivery of supplies and equipment to the ISS and the rotation of the crew of the ISS.