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2020 has probably been the toughest year ever for the global airline industry, as the pandemic forced governments to declare lockdowns and reduce mobility to prevent the spreading of the covid-19 virus. Airlines were the most affected transportation business since many countries started imposing flight bans from and to the rest of the world, and the industry has a particularly high fixed cost structure. In fact, an airline company must pay for fuel whether the airplane is empty or full, and even