An anonymous reader quotes Business Insider:

Airlines have wasted thousands of gallons of fuel running empty “ghost” flights during the coronavirus outbreak because of European rules saying operators can lose their flight slots if they keep their planes on the ground.

Demand for flights has collapsed across the globe amid growing fears about the outbreak. Under Europe’s rules, airlines operating out of the continent must continue to run 80% of their allocated slots or risk losing them to a competitor. This has led to some operators flying empty planes into and out of European countries at huge costs, The Times of London reported.

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Source:: Slashdot