WASHINGTON, Dec. 12 (TNSFR) -- The U.S. Department of Transportation Federal Aviation Administration has proposed to establish U.S. Area Navigation (RNAV) Route T-581 in the vicinity of Missoula, Montana, as part of an effort to improve safety and operational efficiency in the National Airspace System.

The proposal aims to increase navigational flexibility and safety margins for airspace users while expanding Air Traffic Control (ATC) operational capabilities, especially over mounta . . .

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