2007 also saw the continued assembly of the International Space Station, by US Space Shuttle flights. On 8 June made the first Shuttle launch of the year, STS-117, with seven astronauts, and the &lt;a href="Integrated%20Truss%20Structure"&gt;S3/4 truss segment&lt;/a&gt; of the ISS. It was the first Shuttle to launch from Complex 39A at the Kennedy Space Center since STS-107 in 2003. Launch had previously been delayed from February due to Hail damage to the External Tank, which required a rollback to repair in the Vehicle Assembly Building. In August, launched on its first mission since 2002, STS-118. This carried the S5 truss segment, and marked the final flight of the Spacehab module, which was used to carry supplies. NASA's first Educator Astronaut, Barbara Morgan flew aboard STS-118. Morgan had previously been a backup for Christa McAuliffe, who was killed in the "Challenger" accident in 1986. STS-120, launched on 23 October using , carried the "Harmony" node, the first pressurised ISS component to be launched since "Pirs" in September 2001. Attempts to launch "Atlantis" in December on STS-122 were scrubbed, and the launch was delayed to 2008 after ECO sensors in the External Tank failed.