1. ICC Force Major and Hardship Clauses (2020). https://iccwbo.org/content/uploads/sites/3/2020/03/icc-forcemajeure-hardship-clauses-march2020.pdf.
2. Effects of Novel Coronavirus (COVID-19) on Civil Aviation: Economic Impact Analysis. Economic Development – Air Transport Bureau, Canada (2021). https://www.icao.int/sustainability/Documents/COVID-19/ICAO_Coronavirus_Econ_Impact.pdf.
3. Government support to airlines in the aftermath of the COVID-19 pandemic
4. The impacts of the COVID-19 pandemic on transportation employment: A comparative analysis
5. Since April 23, 2020, the Federal Air Transport Agency also allowed 7 airlines to carry cargo in the passenger cabin. https://favt.ru/novosti-novosti/?id=6429.