United States. Government Accountability Office. Next Generation Air Transportation System: Preliminary Analysis of Progress and Challenges Associated with the Transformation of the National Airspace System, text, July 25, 2006; (https://digital.library.unt.edu/ark:/67531/metadc294956/m1/1/: accessed April 26, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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