First, although I bow to your superior knowledge of aviation, I am not at all sure IATA has much to say about domestic airline schedules in the USA. My reading of the document is that IATA has a system for setting Minimum Connecting Times (note the word minimum), which is to facilitate airlines cooperation when connecting, by having a standard agreement by airport for connections. However, they specifically state that these Minimums do NOT absolve the airline of responsibility for ensuring that passengers and their baggage can make the connections they schedule.
IATA is more akin to a standards agency than a regulator. It does not dictate to airlines how they set their schedules or policies, but rathers sets international minimum standards to enable a diverse range of international airlines to meet minimum standards to facilitate cooperation.
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