KENNEDY SPACE CENTER, FLA. - In the transfer aisle of the Vehicle Assembly Building at NASA Kennedy Space Center, the orbiter Atlantis is lifted off the transporter. The orbiter will be raised to a vertical position and lifted up and over the cross-beam into high bay 1 and mated with the Solid Rocket Boosters and External Tank already stacked there on the Mobile Launcher Platform. Atlantis is the designated orbiter for Return to Flight mission STS-121. The lighted planning window for launch extends from Sept. 9 to Sept. 25.

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