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    $\begingroup$ Do you have a reference for this: "Following Columbia, Orbiters were no longer considered to be guaranteed to be capable of returning their crew, so a stand-by STS had to be ready for launch for the duration of a STS mission to the ISS"? Are you talking about the STS-4XX rescue missions? Because if you mean an STS stack was sitting on the pad ready to launch the whole time...no. $\endgroup$
    – Organic Marble
    Commented Dec 2, 2021 at 3:04
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    $\begingroup$ @OrganicMarble the STS-3XX missions, and while the LON missions didn't have to be ready to launch, had to be ready to be ready to launch within the 80 day window and were often stacked ready to launch $\endgroup$
    – user44124
    Commented Dec 2, 2021 at 3:31
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    $\begingroup$ @OrganicMarble better? $\endgroup$
    – user44124
    Commented Dec 2, 2021 at 4:05
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    $\begingroup$ my failing memory did merge the STS-4xx "can't reach ISS had to be stacked" missions (Hubble) with the 64 day STS-3xx "ISS or could reach ISS" missions; so thanks for pointing it out. The 80 day window is the time the ISS LSS could support the additional crew. (not enough priv to upvote your comments) $\endgroup$
    – user44124
    Commented Dec 2, 2021 at 4:13
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    $\begingroup$ Edit looks great! Welcome to space stack exchange. $\endgroup$
    – Organic Marble
    Commented Dec 2, 2021 at 14:15