On October 8, 2008, Atlantis will be launching from LC-39A for the final Hubble Space Telescope repair mission (STS-125.) As Atlantis will not have access to ISS in case of emergency, Endeavour will be in hot-pad status on LC-39B to conduct a rescue if necessary.
Is this the first time two Shuttles will have been on the pads ready for launch at the same time? Will anyone here be able to get photos of what will undoubtedly be a very unique event?
(My source for this data is Aviation Week & Space Technology from June 9, 2008.