"NASA extends rescue missions on manifest"
Quote:
The latest Shuttle manifest shows NASA has extended the number of flights that will have a LON (Launch On Need) rescue mission on standby.
While STS-121 with Discovery has stood down its STS-300 LON (with Atlantis), three more rescue missions have been added to accompany flights through to at least STS-120, with another special - and very different - LON mission being considered for STS-125's Hubble Servicing Mission.
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http://www.nasaspaceflight.com/content/?cid=4626