They missed the plane.
I have another cousin who works in the WTC. Again, luckily, Sept. 11th was his anniversary and he took the day off work.
I have one lucky family.
[Update: My sister related the story to me wrong. Yeah, the airline story happened. But it was only Cousin Scott's wife scheduled to be on the flight. It still would have been a horrible blow to my family, but...not as deveastating as it could have been.]