CHICAGO — As market participants digested the news of American Airlines' Chapter 11 federal bankruptcy filing Tuesday, airports stressed their ability to withstand any potential impact while tax-exempt investors reached out to bankruptcy attorneys to gauge the strength of their holdings.

The airline — a subsidiary of AMR Corp. based in Fort Worth, Texas — reported guarantees covering at least $1.5 billion of outstanding bonds with total payments upon maturity reaching $3.2 billion at the close of 2010, American's financial filings say.

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