1. Airbus, Global Market Forecast - Flying by Numbers, Technical report, 2015.
2. Boeing, Current Market Outlook 2015–2034, Technical report, 2015.
3. NASA, Advanced Air Vehicle Program, 2016.
4. Air Transport Action Group (ATAG), The Global Flightplan, in: Proceedings of the 19th Conference of the Parties (COP19) to the United Nations Framework Convention on Climate Change, updated with the results of the 38th ICAO Assembly, number November, 2013.
5. Advisory Council for Aeronautical Research in Europe (ACARE), European Aeronautics: A Vision for 2020, Technical Report January 2001.