WASHINGTON — The acquisition of American Airlines by either of two competitors could result in a negative outlook for small to medium-sized airports, Moody’s Investors Service said Monday.

Both Delta Airlines and US Airways are reportedly considering acquisitions of AMR, American Airlines’  parent company, which filed for bankruptcy in November. If either merger takes place, the result would probably be reduced passenger volume and a negative implication for airport credit ratings, according to Moody’s.

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