Contingency Mission
The Contingency Shuttle Crew Support mission which would have been launched in the event that Endeavour became disabled during STS-126 would have been performed by Discovery. It would have been a modified version of the STS-119 mission of Discovery, which would have involved the launch date being brought forward, but the goal would have been to carry STS-119's full payload and complete the mission as planned, in addition to rescuing the crew of STS-126.
Read more about this topic: STS-126
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