Did you actually read the Bloomberg article? For the sake of AA one hopes the $4 billion dollars will be enough to get them through their filing. In addressing this concern the article also stated "The airline’s likeliest sources for more cash in Chapter 11 would be companies with which it already has a relationship, said Will Randow, an analyst at Citigroup Inc. (C) in New York. American used about $1 billion cash in the third quarter and about $500 million since then, Randow said, making him skeptical of the airline’s assertions of having sufficient cash." But the article also referenced an AA sugar daddy stating "Citigroup, the credit-card partner for American’s AAdvantage loyalty program, would be “highly likely” to help with financing if AMR asks, Straebler said. New York-based Citigroup helped American raise $1 billion in 2009 through the advance purchase of frequent-flier miles." So chances are AA will make it through this filing without the need for DIP. But once again, at this time no one knows for sure how this situation will play out.