CHICAGO — Municipal buyers gave their blessing to US Airways Group Inc.’s marriage with bankrupt AMR Corp. by ascribing near to full value to AMR subsidiary American Airlines’ unsecured tax-exempt debt traded Thursday, the day the deal was formally announced.

The airline has about $1.5 billion of unsecured municipal bonds. “The bonds are all up,” said Jon Barasch, director, municipal evaluations at Interactive Data, after reviewing trading activity on a series of CUSIPs.

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