Another airline

Northwest Airlines has recently decided to file for Chapter 11 bankruptcy. This happened just minutes after their rival airlines Delta also filed under Chapter 11. These two mark just a few more in the growing list of airlines filing for bankruptcy. Other than rising fuel prices and the effects of terrorism are there any more reasons for airlines to be filing bankruptcy? Also what kind of effect will the growing number have on our economy? Is it safe that the major part of our travel is with companies who are bankrupt? And finally will this trend continue with other airlines filing or is this the end of the line with bankrupting airlines?

http://money.cnn.com/2005/09/14/news/fortune500/northwest/index.htm