The orbiter Atlantis on top of its transporter comes to a stop in the transfer aisle of the Vehicle Assembly Building.

The orbiter Atlantis, on top of its transporter, comes to a stop in the transfer aisle of the Vehicle Assembly Building after the short trip from the Orbiter Processing Facility. First motion out of OPF was at 6:19 a.m. EST. Once in the VAB, Atlantis will be lifted into high bay 1 and mated with the external tank and solid rocket boosters already in place on the mobile launcher platform. The rollover signals the start of the journey to the launch pad for liftoff on mission STS-117 targeted for March 15. The mission is the 21st to the International Space Station and will deliver the S3/S4 starboard truss segments. Photo credit: NASA/Kim Shiflett