CHICAGO — The federal government's attempt to block bankrupt American Airlines' merger with US Airways Group Inc. could have a "marginally positive" impact on U.S. airports if it means the trend of airline consolidation is at its end, Fitch Ratings said in a report published Friday.

"If this move signals the end of the consolidation trend in the airline business, airports will generally benefit as more carriers (and competition) increase the routes and require more services," Fitch said.

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