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Grand Canyon gives incentive for quieter aircraft

The Associated Press//January 2, 2014//[read_meter]

Grand Canyon gives incentive for quieter aircraft

The Associated Press//January 2, 2014//[read_meter]

In this Oct. 4, 2013 file photo, tourists board a helicopter for a tour over Grand Canyon National Park, in Tusayan, Ariz. The fees for air...

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