1. (2006) Airlines: Delta Airlines: retired pilots group objects to latest wage concessions. Wall St J, May 24
2. (2006) American Airlines unions approve concessions deal. USA Today. http://www.USAToday.com
3. (2006) Northwest finance executive says labor cost reductions critical to survival. PRNewswire. http://www.prnewswire.com
4. (2006) Timeline of United Airlines’ bankruptcy. Forbes. http://www.forbes.com
5. (2005) U.S. airline bankruptcy rankings. N Y Times Mag http://www.nytimes.com/2005/11/07/business/08web-bankruptcy.html