looking at flights for Thanksgiving for my college son and came across a fare on US that was $75 cheaper buying the refundable ticket than if bought as non-refundable. Never seen that before .... And good in both directions on the day before and the Sunday after the holiday. Seemed to only be good for the non stop flight (1 per day). I almost overlooked it, as I never look at the refundable pricing typically. Reminder that mistakes can take different forms.