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المصادر :- https://www.icao.int/sustainability/Documents/COVID-19/ICAO_Coronavirus_Econ_Impact.pdf https://www.unwto.org/news/covid-19-international-tourist-numbers-could-fall-60-80-in-2020 https://www.youtube.com/watch?v=xpIs8Y9vgSs https://www.weforum.org/agenda/2020/05/this-is-what-travelling-will-be-like-after-covid-19/ https://www.businessinsider.com/richard-branson-caught-employee-sleeping-at-virgin-australia-office-2016-6 https://www.euronews.com/2020/05/22/analysis-can-the-aviation-industry-survive-the-coronavirus-crisis