Numbers for 3 troubled airlines

— US Airways, United Airlines and American Airlines are seen as the major carriers most at risk of a cash crisis, even possible bankruptcy, by early next year. Some analysts predict they will have less cash for their size than US Airways, Delta and Northwest did when they filed for bankruptcy protection in 2004-05.

Here are some key financial numbers on each, plus major airline-industry bankruptcy filings of the past 10 years:

— US Airways Group Inc., based in Tempe, Ariz.

2008 results, $12.1 billion in revenue, net loss of $2.2 billion; unrestricted cash on June 30, $1.7 billion.

— United Airlines parent UAL Corp., based in Chicago.

2008 results, $20.2 billion in revenue, net loss of $5.3 billion; unrestricted cash on June 30, $2.6 billion.

— American Airlines parent AMR Corp.

2008 results, $23.8 billion in revenue, net loss of $2.1 billion; unrestricted cash on June 30, $2.8 billion.

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Major airline bankruptcy filings since 1999:

— Delta Air Lines, September 2005

— Northwest Airlines, September 2005

— ATA Airlines, October 2004

— US Airways, September 2004

— United Airlines, December 2002

— US Airways, August 2002, Note A

— Trans World Airlines, January 2001, Note B

Note A — This carrier later combined with America West Airlines to form US Airways Group Inc.

Note B — While in bankruptcy protection, TWA was purchased by AMR and no longer operates as a separate carrier.

Sources: Company regulatory filings, press releases.