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What is the policy on aircraft flights over wilderness?

There are restrictions for aircraft flights only over the Boundary Waters Canoe Area Wilderness. The Federal Aviation Administration has issued a Notice to Airmen that a minimum altitude of 2,000 feet above the terrain (or above the uppermost rim of a canyon or valley) over wilderness and National Parks be voluntarily observed by all aircraft. Boundaries of many wildernesses are marked on aeronautical maps produced by the National Aeronautics and Space Administration. In some wildernesses, military over flights and other airplanes can be heard by visitors. The Forest Service and National Park Service are cooperatively studying the effects of aircraft noise on visitors in selected wildernesses and parks.

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