Delta has not filed (yet), neither has American. US Airways is on it's second filing, the most recent in September of last year. A google search on the airline's name and "bankruptcy" will quickly get you the rest of the dates.
This site has a quick overview that might be useful:
http://www.hasbrouck.org/articles/bankruptcy.html
Last edited by djk7; May 20, 2005 at 8:27 am
Reason: Added link