I was on a plane, heading to Mexico - the way they fly to Mexico, is to fly over New York, then down the coast. We were about 1 hour outside of New York when it happened, we got turned around, and sent to Nova Scotia, Canada. We had no idea what had gone on, neither did the Captain, originally told it was a bomb in the world trade centre.
It was only after we'd landed that we became aware of what had actually happened.
Spent about 7 hours on the ground, in the plane, whilst the checked out who was on ours and about 100 other flights (we were lucky, we landed 4th. off the plane, taken to a university in a smallsih place called Halifax, Nova Scotia. We finally managed to ring home to let our folks know we were ok about 12 hours after the tragedy, spent the next few days watching news reports in shock.
We spent 3 days in Canada, and I'll never forget how amazing the people there are.
A colleague of mine was heading for NY & spent about 5 days in Canada in a gym somewhere. I was on the road with someone in the British Army. We heard the news on the radio of the first plane and his instant reaction was terrorist attack. Went home to watch the rest of the tradegy unfold.