CAPE CANAVERAL, Fla. -- The rare sight of two fully assembled shuttles on both of Kennedy Space Center's launch pads at the same time will happen for the last time in September.

NASA will have both shuttles on pads for the first time since 2001 and for only the 17th time in more than a quarter-century of shuttle fleet operations.

The sight will come after the planned Aug. 29 rollout of shuttle Atlantis to launch pad 39A in preparation for NASA's fifth and final Hubble Space Telescope servicing mission.