It's not truly a security issue, although that is a factor now with the luggage, it's the airline software that calculates fares based on their perceived needs.
Here is a link. It's a little hard to follow but it gives you some ideas what goes into calculating airfares.
http://www.demarcken.org/carl/papers/IT ... /img0.html
Add into this such things as charging to change a reservation or to fly standby on the same day (when by doing so you will open a seat on the later flight) and you get an idea of a few of the aspects of how some of the airlines have gotten themselves into such financial problems.
Of course top-heavy payscales for pilots and execs, trying to maintain too many different types of aircraft (parts, personnel and training) and trying to keep rapidly aging aircraft in the air plus rising fuel prices don't help things either.
Another on airfares from Consumer Reports. This is in Adobe Reader format. If you don't have the software you can download a reader free from Adobe:
http://ostpxweb.dot.gov/aviation/domfares/web003.pdf
Other air travel stories:
"Why Business Travelers will always pay more to fly"
http://www.usatoday.com/travel/columnis ... sman_x.htm
All things considered, airfares really are a bargain when you consider they're not much more than they were 10 years ago.
"Why airfares stay so low — while airlines struggle"
http://www.usatoday.com/travel/flights/ ... ices_x.htm