Finals40
The simple answer to your question is yes at least in the U.S because of 2 reasons.
Firstly, the general public is simply scared. The events of September 11th left some very deep scars that won't heal quickly. As for myself, I was moving a Data Center starting on September 15th from New Jersey to Texas and we were chartering a private jet service to transport equipment etc. out of Newark. Needless to say, we didn't move until the following weekend and I was on the jet ensuring the safe delivery of equipment. I didn't especially feel like flying at that time, but I'm glad I did..sort of like falling off your bike and getting back on again.
Secondly, people refuse to arrive at check-in 2 hours early for a domestic flight and put up with the new security regulations in place. These are your normal type hoidaymakers. In the N.E US, it's just as easy if not quicker to take an Amtrak train from N.Y to Washington and you end up getting their earlier with minimal hassle. And both holidaymakers and business people are now using this as an alternative option.