I remember that my wife was in hospital in Kingston, Ontario that day and we watched the news on TV. The horror of it all is still with me today. I saw the live coverage of the second plane hitting the tower and remember my complete disbelief when the towers collapsed.
Since that hospital is an alternative emergency hospital for disaster relief, my wife was sent home to make room for a possible overflow of injured patients since her condition was not considered critical then. At that time they were estimating upwards of 30,000 people might have been in the towers. Thank God that was not true although the actual death toll was devastating enough.