There are a ton of threads under the various airlines in the Airline Programs forums. I thought I would try to put together a list of some of the current threads. Please post links to other threads in this thread. Also if there are good articles that you run into relating to airline bankruptcies in general this might be a good place to put them.

According to this article the airlines currently in bankruptcy are United Airlines, US Airways, Hawaiian Airlines, ATA Airlines (also known as "American Trans Air"), and Aloha Airlines.

There are plenty of rumors about Northwest and Delta filing in the next few days. I see a thread under Independence Air about the potential for it filing chapter 11. This article suggest that they might even liquidate.

Here are some of the current airline threads:

Delta

Would a merger make sense for Delta?
WSJ: Delta To File For Chpt. 11 This Week
Bankruptcy & Partner Tickets
How Would A BK Filing Affect DL Employees Stock Options?
Would a merger make sense for Delta?
Delta to sell planes, cut jobs as bankruptcy looms

Independence

Chapter 11 Now rather than Later

Northwest

NEWS: DAL bankruptcy filing Thurs Sept 15th..WSJ..
RUMOR: NW bankruptcy
NEWS: NWA: Time running out to avoid bankruptcy Associated Press

You missed some

The AC forum feels the need to post all bankruptcy stories, regardless of the airline or their applicability to AC or *A.