The sign of doom in the restaurant business, apparently, is when your suppliers start asking for cash in advance. (According to Anthony Bourdain, anyway.) In that context, the Times has bad news for US airlines:

Sources within the airline industry indicate that credit is being denied to most of the leading American carriers and the practice is moving to Europe and Asia. So uncertain is the cash solvency of the industry that jet fuel suppliers insist on prepayments into special bank accounts...
The need to put up money before delivery of fuel is a huge financial burden that has been shifted from the oil companies to the airlines. According to John Armbrust, a US jet fuel consultant, the oil industry had $5 billion (£2.5 billion) of jet fuel credit outstanding to airlines before the 9/11 terrorist attacks. Now they are demanding that airlines leave cash on deposit.
“The airlines can’t afford it. Traditionally, oil companies extended credit for 14 or 21 days and some as long as 30 days. Now, most American airlines are on prepay. South West is one of a few likely to still get credit."

And via Calculated Risk comes this (not airline-related):

Standard & Poor’s Rating Services said Wednesday evening that it had slashed the ratings of 1,326 Alt-A residential mortgage-backed securities, after recent data is proving performance of Alt-A loans originated in 2006 and 2007 to be particularly problematic. The downgrades affect $33.95 billion in issuance value and affect Alt-A loan pools securitized in the first half of 2007 — roughly 14 percent of S&P’s entire Alt-A universe in that timeframe.

Perhaps more telling were an additional 567 other Alt-A classes put on negative credit watch by the ratings agency.

A review of affected securities by Housing Wire found that all of the classes put on watch for a pending downgrade are currently rated AAA, suggesting that S&P’s confidence in thin overcollateralization typical of most Alt-A deals is quickly waning.