When an impending change is made, a disclaimer will be written on any correspondence to passengers. Airlines have legal departments and they have half a brain so they know to plan ahead. If a ticket is purchased by and documents are mailed to a passenger before the April 10th change, the disclaimer will read something like, "Minimum check-in time before Apr 10 is 30 minutes. Check-in time for all domestic flights on and after April 10th have a minimum check-in time of 45 minutes"
Airlines have no heart but they are not stupid. They legally cover their a$$e$ to the best of their ability and I will assure you that this disclaimer was published.
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