I was 30,000 feet up in the air, flying from London to Dallas.
We were about an hour or so flight from NY or the east coast when the planes struck the towers.
The plane made a U-turn, as US airspace got closed off, and we landed in a small town called Gander, Newfoundland, where I sat in the plane on the tarmac for about 7 more hours before being let off. The BBC came on the speakers in the plane, and we learned what happened.
Then I slept in a church, on a church bench, for 4 days, before being flown back to London, then to Copenhagen.
Here's a website about it:
http://www.theganderconnection.org/