moved to a worksite on the P3 truss to inspect portions of that truss. September 16 (Flight day 8) Day 8 of STS-115, the last full day with Space Shuttle Atlantis docked to the ISS, was mainly spent in preparation for the undocking procedures to occur in flight day 9. The crew spent the morning resting following their highly successful mission, and then began getting ready for the undocking by carrying out transfers of ISS equipment and science experiments onto Atlantis ready for the trip home. The crews of Expedition 13 and STS-115 also took part in the traditional joint-crew news conference, with mission Commander Brent Jett commenting on the success of the mission and on the construction missions to follow: "All of the rest of the assembly missions are going to be challenging. We have similar payloads flying in the future. We are off to a good start on assembly. I think we can pass along a lot of the lessons to the future crews." September 17 (Flight day 9) Flight day 9 saw the end of STS-115's tasks at the ISS as Atlantis undocked from the International Space Station at 12:50 UTC. Following the traditional farewell ceremonies between Expedition 13 and STS-115, the hatch between Atlantis and the ISS was closed and locked at 10:27 UTC. Then, after a series of checks for leaks, Atlantis left the dock to begin its 360-degree flyaround of the expanded ISS to document the new configuration. September 18 (Flight day 10) The crew of STS-115 spent the morning of Flight Day 10 carrying out final inspections of Atlantis heat shield in preparation for re-entry on flight day 12. Orbiting around behind the ISS, the crew used the Orbiter's robotic arm and boom sensor system to make sure that no damage had been done to Atlantis nose and wing leading edges by micrometeoroids and other space junk. The crew spent the rest of this light duty day stowing equipment in preparation for re-entry and landing. September 19 (Flight day 11) During the morning of day 11, astronauts Jett and Ferguson tested Atlantis reaction control thrusters and practiced for landing using on-board computers. The thrusters will be used to position the shuttle during re-entry. The crew also took some time for interviews, with Ferguson telling the media that everyone on board was looking forward to landing. "I think we all, thus far, feel pretty