FrontMatter -- Preface -- Acknowledgments -- Contents -- Figures and Tables -- Acronyms -- Summary -- 1 Background and Overview -- 2 Wingtip Modifications -- 3 Previous Analyses and Experience with Wingtip Modifications on Existing Aircraft -- 4 Assessment of Wingtip Modifications for Various Air Force Aircraft and Potential Investment Strategies -- Appendixes -- Appendix A: Data Used in Net Present Value Analyses -- Appendix B: Additional Methods for Improving Fuel Consumption -- Appendix C: Presentations to the Committee -- Appendix D: Biographical Sketches of Committee Members.