1. Boeing
, “Boeing: Commercial Market Outlook,” https://www.boeing.com/commercial/market/commercial-market-outlook/, August 25, 2020.
2. Airbus, S.A.S.
, “Global Market Forecast 2019-2038: Cities, Airports & Aircraft,” https://www.airbus.com/content/dam/corporate-topics/strategy/global-market-forecast/GMF-2019-2038-Airbus-Commercial-Aircraft-book.pdf, August 25, 2020.
3. Boeing
, “Boeing: The Boeing Company: General Information,” https://www.boeing.com/company/general-info/index.page#/overview, August 25, 2020.
4. Airbus
, “Orders and Deliveries,” https://www.airbus.com/aircraft/market/orders-deliveries.html, August 25, 2020.
5. IATA
, “COVID-19: Outlook for Air Travel in the Next 5 Years,” https://www.iata.org/en/iata-repository/publications/economic-reports/covid-19-outlook-for-air-travel-in-the-next-5-years/, August 25, 2020.