For the travel industry, the news couldn’t be much worse. For the past three weeks, airlines have barely limped along, with share prices plummeting. Norwegian Air today announced it would be laying off 50% of its staff. Airlines most affected are likely to be those running regular transatlantic routes, including the German airline Lufthansa and Air France-KLM, which has its headquarters in the Netherlands. These new restrictions will affect 3,500 flights per week and up to 800,000 passengers, according to aviation analysts at Bernstein.

How much it’ll all cost is a harder question to answer. Before the travel bans were announced, the International Air Traffic Association predicted annual revenue losses of $113 billion to the sector. These additional restrictions will likely require revisiting these already troubling numbers. The only bright spot, if you can call it that, is a near-guaranteed fall in carbon emissions, with fewer gas-guzzling flights taking to the sky. But given the number of jobs lost in the process—and the tragic circumstances—it’s decidedly cold comfort.

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