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Moody’s Investors Service put its ratings on MGM Mirage (MGM) on review for possible upgrade after the casino operator said it is trying to extend the maturity dates on $5.55 billion of credit lines to 2014 from next year.

Moody’s vice president Peggy Holloway said an extension “would be a positive step forward for MGM with respect to near-term financial flexibility as well as its longer-term ability to remain viable as a going concern.” The proposed amendment also would allow the company to issue more secured debt, which could be used to refinance other borrowings. More >