Murphy's law. Parents booked on DL1548 DTW-LGA at 12:01pm. At one point this morning was showing a 3 hour delay. Decided to cut our loses and booked them on AA via DCA. DL1548 ends up only having a 30 minute delay! But they were much less stressed. When the decision had to be made, there were too many unknowns. Oh well. Lost 30k skypesos that weren't of much use anyway.