附註:Includes bibliographical references.
""FrontMatter""; ""Preface""; ""Acknowledgment of Reviewers""; ""Contents""; ""Tables and Figures""; ""Executive Summary""; ""1 Top-Level Assessment""; ""2 Assessment of the Vehicle Systems Program""; ""3 Assessment of the Airspace Systems Program""; ""4 Assessment of the Aviation Safety Program""; ""Appendixes""; ""A Committee and Panel Member Biographies""; ""B Statement of Task""; ""C Committee and Panel Activities""; ""D National Research Council Questionnaire""; ""E List of Tasks in NASA�s Aeronautics Technology Research Portfolio""; ""F Abbreviations and Acronyms""