For instance, the possibility of an event killing a lot of people is a one in a billion. Our systems are very redundant and failsafe. They fail in a benign manner. I do a lot of work developing anti-lock software. Airplanes are tested to such a high degree.
Most crashes are the result of pilot error.
The reputation of the airline. Right now there are more jobs than people in the aerospace industry, so that brings salaries up. China is waking up, all the developing countries want to travel, half the airline market is replacing airplanes. Right now Boeing is booming. We recently had to temporarily shut down the 747 and 737 production lines so our parts suppliers could get caught up.