I was on a trip in England at the time and had some free time so I was playing golf at a local course. Some people said a plane had hit the WTC so I figured it was a Cessna or something. When I saw the video I was amazed. I was scheduled to fly out several days later and wondered if they would restart service by then. Fortunately they did but there were lots of people who were stranded. By being booked on a non-cancelled flight, I did not have to worry, but there a number of people whose flights were cancelled trying to get on anything back to the USA.The flight from LGW (yes, DL flew there at the time) to ATL was packed and had extra security but the rest of the flights home were empty. The empty flights were eerie and quiet. Airports deserted. Don't want to go through that again.