Why is the airline industry so unstable? How is and industry that has tons of customers so volatile? Unstable gas prices? That can't be it. Are the airlines undercutting that much? It seems like everyone has to deal with it, customers and employees.
Because it is a capital intensive business with high fixed costs. If you presented the basic facts of an airline to a set of first year business majors WITHOUT identifying it as an airline they'd tell you that you'd be insane to invest in or attempt to run such a business - and in fact most of them would tell you such a business could not exist.
So why do airlines exist? Because you CAN make a lot of money when the cycle is right (precisely because it is capital intensive and fixed cost), but like gambling you have to get in at the right time and pick your money up from the table and walk away at the right time - and both those things require a) the discipline to do it and b) finding some sucker willing to take over from you. Because unlike black jack there is a cost to getting up from the table.
In fact there are other capital intensive fixed cost businesses. Telecom is one such business - and that business has gone through the same fiasco as the airlines with de-regulation and is just now emerging with the only viable business model - large, consolidated players with a few companies coming and going nipping at their heels. I used to read reasoned opinions from apparently perfectly sane people tha long distance phone calls should be free - because the phone company already had the switches and lines and there was no cost to use them. The same argument could be made for the airlines - tickets should just cover the fuel - after all the airlines already have the planes......