STS-400 was the backup rescue mission for STS-125, the final hubble repair mission. It was rolled out to the pad, giving all the once off view of two shuttles on pads 39A and 39B at the same time.
In this part of NASA - The forgotten missions - STS-400 goes to the rescue of STS-125.
Requires Shuttle Fleet 4.2
Optional my Canaveral39A add-on for the 400 pad
Enjoy
rossco