In this book on subsidy of the U.S. large commercial aircraft (LCA) industry the Author redefines the terms of the Airbus/Boeing subsidy debate. he does this by introducing new categorizations for the Research and Technology benefits to the U.S. large commercial aircraft industry. The book introduces a new level of methodological precision in the database upon which the factual claims rest. The analysis derives from on an exhaustive search of U.S. public databases and also date on federal R&D contracts obtained under the Freedom of Information Act (FOIA) in the USA. The overall analysis brings together these top down and bottom up approaches into a rounded and balance account of U.S. federal funding of the large commercial aircraft sector. Starting with an explanation and scope of the study, the book goes on the review; U.S. industrial policy for the aerospace industry, the NASA subsidy of U.S. LCA Sector R&D and the Department of Defense subsidy of the LCA Sector, and Federal subsidy of U.S. LCA; it ends with Conclusions, followed by detailed appendixes.