1. Aerospace Industries Association (AIA), 2015. 2014 Year-end review and forecast. http://www.aia-aerospace.org/assets/2014_AIA_Annual_report_web.pdf .
2. ———, 2016a. U.S. exports of aerospace products Calendar Years 2010–2015. http://www.aia-aerospace.org/assets/Series_06_-_Exports.pdf .
3. ———, 2016b. U.S. imports of aerospace products calendar years 2010–2015. http://www.aia-aerospace.org/assets/Series_07_-_Imports.pdf .
4. Air Transport Action Group, 2016. Facts & figures. http://www.atag.org/facts-and-figures.html .
5. Battelle. 2013. 2014 Global R&D funding forecast. https://www.battelle.org/docs/tpp/2014_global_rd_funding_forecast.pdf .