For the first time since July 2001, two shuttles are on the launch pads at the same time at NASA's Kennedy Space Center. Space shuttle Endeavour completed a 4.2-mile journey to Launch Pad 39B on Friday, September 19, at 5:59 a.m. CDT. Then the Endeavour left Kennedy's Vehicle Assembly Building at 10:15 p.m. Thursday, traveling at less than 1 mph atop a massive crawler-transporter.

The reason behind this decision is that the Endeavour will stand by at pad B in the unlikely event that a rescue mission is necessary during space shuttle Atlantis' upcoming mission to repair NASA's Hubble Space Telescope, targeted to launch October 10. After Endeavour is cleared from its duty as a rescue spacecraft, it will be moved to Launch Pad 39A for the STS-126 mission to the International Space Station. That flight is targeted for launch November 12. STS-126 is the 27th shuttle mission to the International Space Station.

Veteran space flier Navy Capt. Christopher J. Ferguson will command the STS-126 mission aboard Endeavour to deliver equipment to the International Space Station that will enable larger crews to reside aboard the complex. Air Force Lt. Col. Eric A. Boe will serve as the pilot. The mission specialists are Navy Capt. Stephen G. Bowen, Army Lt. Col. Robert S. Kimbrough, Navy Capt. Heidemarie M. Stefanyshyn-Piper and NASA astronauts Donald R. Pettit and Sandra H. Magnus.

Magnus will remain on the station, replacing Expedition 17/18 Flight Engineer Gregory E. Chamitoff, who returns to Earth with the STS-126 crew. Magnus will serve as a flight engineer and NASA science officer for Expedition 18. Magnus will return to Earth on shuttle mission STS-119.

Endeavour will carry a reusable logistics module that will hold supplies and equipment, including additional crew quarters, a second treadmill, equipment for the regenerative life support system and spare hardware.