I am sure there are some people who only travel by air once every other year or so, but, most of my colleagues and associates have travel habits similar to mine. We are upper middle class health care professionals (ie, doctors). Our day to day work doesn't involve travel, so, unless a doctor is a regular speaker at continuing education conferences, we might go to maybe two or three meetings a year (I need 50 hours per year to stay board certified. The usual conference meets about 4-6 hrs or so a day, so, I need to attend probably 8-10 full days per year). Additionally, I might make one or two personal trips a year (like to WDW in June). Usually, I try to choose meetings that are in locations attractive to my whole family--we have gone to Santa Fe, Charleston, SC, Sanibel, to name a few. So, it is unrealistic to state that travelers like us would have no impact on the bottom line of airlines. I don't travel enough to be a frequent flyer, particularly since we typically don't use the same airline all the time for all trips. My hospital uniformly will pay only for the absolute cheapest airfare, and I am sure this is not unique to my hospital.
Before you poo-poo how important continuing medical education is to the entertainment and travel industry, consider that prior to 2002, pharmaceutical companies were able to pay more for dinners, meetings, etc. In our area, very nearly every nice restaurant that used to host dinners of that type, and were thriving, have gone out of business. I further wager that, if you would check, that in Orlando, I think I could choose to go very nearly any week of the year, and would be able to find a meeting that would be applicable to my specialty. As a matter of fact, the one I am attending in August is at Grand Floridian. That is how I found that meeting. I wanted one that wasn't too close to my June vacation, before school started or during fall or Christmas break, and was somewhere at Disneyworld. Bingo. I think I had two or three for the same week I am going to choose from.