And airlines, hotels, car rentals....
I had just come out of college, and was a management consultant w/ a big 5 firm starting the Monday after 9/11. So I was traveling a ton for work. Needless to say, I was scoring flights from JFK-LHR on weekends for on average $180 round trip. We used any excuse whether it be a Harry Potter premier, Bond Movie premier, to have lunch at a favorite Chinese restaurant, hit up clubs, etc.. It was fun to say the least.

Got to know some ticket agents at both airports, never flew coach.
But outside of that though, demand for most other things was ok. Financial Services and Tech sectors became a disaster though. Most of my friends that were on Financial Services projects got laid off. I came out of school as a Java developer and quickly switched into project mgmt in the healthcare sector because I saw what was going down in IT with offshoring...smart move.