Our overall airplane efficiency gain is derived from studies of new airplane designs within each of the major airplane size classes: narrowbody, widebody, and regional. Efficiency gains for each future airplane design are relative to existing 2010 designs.
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B: NASA and MIT. 2010.NASA N+3 MIT Team Final Review. NASA Langley Research Center; Kawai, Ronald T, Douglas M Friedman, and Leonel Serrano. 2006.Blended Wing Body Boundary Layer Ingestion Inlet Configuration and System Studies. NASA.
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F: Daggett, David L. 2002. Ultra Efficient Engine Technology Systems Integration and Environmental Assessment. NASA link