1. 2019 End-Year Reporthttps://www.iata.org/en/iata-repository/publications/economic-reports/airline-industry-economic-performance---december-2019---report/
2. Pneumonia of Unknown Cause—China;WHO,2020
3. Public Health Agency of Sweden. Nytt Coronavirus Upptäckt I Kinahttps://www.folkhalsomyndigheten.se/nyheter-och-press/nyhetsarkiv/2020/januari/nytt-coronavirus-upptackt-i-kina/
4. International Civil Aviation Organization. Economic Impact Estimates Due to COVID-19 Travel Banshttps://www.icao.int/Newsroom/Pages/Economic-impact-estimates-due-to-COVID-19-travel-bans.aspx
5. COVID-19 Cuts Demand and Revenueshttps://www.iata.org/en/pressroom/pr/2020-02-20-01/